Fix lint checks on PHP 7.3 CI

[Pytal]

OCP package christophwurst/nextcloud is set to ^20.0.0, the minimum supported version of the app

An OCP version matrix is also added to lint against newer versions

[Pytal]

@nickvergessen @CarlSchwan any ideas on the errors?

[Pytal]

Some errors may be fixed by ChristophWurst/nextcloud_composer#18

[Pytal]

For this error

christophwurst/nextcloud v22.1.1 requires psr/container ^1.0 -> found psr/container[1.0.0, 1.1.0, 1.1.1, 1.1.2] but the package is fixed to 2.0.2 (lock file version) by a partial update and that version does not match.

The dependency tree of this app https://github.com/nextcloud/files_antivirus shows nextcloud/coding-standard:^0.4.0 -> friendsofphp/php-cs-fixer:^2.17 -> ... -> psr/container:^2.0

But in the server 3rdparty repo the latest is psr/container v1.1.1 https://github.com/nextcloud/3rdparty/tree/d80ec1fa2dad1c3ede272583e3c4f1f77f40141b/psr/container so we can't proceed with ChristophWurst/nextcloud_composer#18 (comment)

Not sure how to resolve these conflicts, any ideas @CarlSchwan?

[PVince81]

@ChristophWurst can you help with the above question about dependency issues ?