Update license headers for Nextcloud 20 (again)

[ChristophWurst]

There are still lots of outdated headers, so time for another round of
updates.

Follow-up to #22393.

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 32755: failure

mysql5.6-php7.2

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There were 2 warnings:

1) Test\Files\ViewTest::testRenameFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static

2) Test\Files\ViewTest::testCopyFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static

--

There was 1 failure:

1) Test\Share20\DefaultShareProviderTest::testGetSharedWithGroupUserModified with data set #1 ('smb::whatever', 'files/test.txt', 'files/test2.txt')
Failed asserting that actual size 0 matches expected size 1.

/drone/src/tests/lib/Share20/DefaultShareProviderTest.php:1115

acceptance-app-files-sharing

• tests/acceptance/features/app-files-sharing.feature:338

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  Scenario: sharee can revoke create permission from reshare after the sharer disabled it # /drone/src/tests/acceptance/features/app-files-sharing.feature:338
    Given I act as John                                                                   # ActorContext::iActAs()
    And I am logged in as the admin                                                       # LoginPageContext::iAmLoggedInAsTheAdmin()
    And I act as Jane                                                                     # ActorContext::iActAs()
    And I am logged in                                                                    # LoginPageContext::iAmLoggedIn()
    And I act as Jim                                                                      # ActorContext::iActAs()
    And I am logged in as "user1"                                                         # LoginPageContext::iAmLoggedInAs()
    And I act as John                                                                     # ActorContext::iActAs()
    And I create a new folder named "Shared folder"                                       # FileListContext::iCreateANewFolderNamed()
    And I see that the file list contains a file named "Shared folder"                    # FileListContext::iSeeThatTheFileListContainsAFileNamed()
    And I share "Shared folder" with "user0"                                              # FilesAppSharingContext::iShareWith()
    And I see that the file is shared with "user0"                                        # FilesAppSharingContext::iSeeThatTheFileIsSharedWith()
    And I act as Jane                                                                     # ActorContext::iActAs()
    And I open the Files app                                                              # FilesAppContext::iOpenTheFilesApp()
    And I share "Shared folder" with "user1"                                              # FilesAppSharingContext::iShareWith()
    And I see that the file is shared with "user1"                                        # FilesAppSharingContext::iSeeThatTheFileIsSharedWith()
    And I act as John                                                                     # ActorContext::iActAs()
    And I set the share with "user0" as not creatable                                     # FilesAppSharingContext::iSetTheShareWithAsNotCreatable()
    And I see that "user0" can not create in the share                                    # FilesAppSharingContext::iSeeThatCanNotCreateInTheShare()
    And I act as Jim                                                                      # ActorContext::iActAs()
    And I open the Files app                                                              # FilesAppContext::iOpenTheFilesApp()
    And I enter in the folder named "Shared folder"                                       # FileListContext::iEnterInTheFolderNamed()
    And I create a new folder named "Subfolder"                                           # FileListContext::iCreateANewFolderNamed()
    And I see that the file list contains a file named "Subfolder"                        # FileListContext::iSeeThatTheFileListContainsAFileNamed()
    When I act as Jane                                                                    # ActorContext::iActAs()
    And I open the Files app                                                              # FilesAppContext::iOpenTheFilesApp()
    And I open the details view for "Shared folder"                                       # FileListContext::iOpenTheDetailsViewFor()
    And I see that the details view is open                                               # FilesAppContext::iSeeThatTheDetailsViewIsOpen()
    And I open the "Sharing" tab in the details view                                      # FilesAppContext::iOpenTheTabInTheDetailsView()
    And I see that the "Sharing" tab in the details view is eventually loaded             # FilesAppContext::iSeeThatTheTabInTheDetailsViewIsEventuallyLoaded()
    And I set the share with "user1" as not creatable                                     # FilesAppSharingContext::iSetTheShareWithAsNotCreatable()
    Then I see that "user1" can not create in the share                                   # FilesAppSharingContext::iSeeThatCanNotCreateInTheShare()
    And I see that "user1" can not be allowed to create in the share                      # FilesAppSharingContext::iSeeThatCanNotBeAllowedToCreateInTheShare()
    And I act as Jim                                                                      # ActorContext::iActAs()
    And I open the Files app                                                              # FilesAppContext::iOpenTheFilesApp()
    And I enter in the folder named "Shared folder"                                       # FileListContext::iEnterInTheFolderNamed()
    And I see that it is not possible to create new files                                 # FileListContext::iSeeThatItIsNotPossibleToCreateNewFiles()
      Failed asserting that true is false.