Crash on extension launch

[Sovhan]

Describe the bug
When opening a robot file and hereby launching the robocorp.robotframework-lsp extension in VSCode, no support is provided for robot framework language because of a crash.

To Reproduce

1. Open a .robot file with a test case depending on local libraries
2. observe logs as such:
   lsp: 2021-09-21 12:00:28 UTC pid: 361525 - Thread-1 - INFO - robocorp_ls_core.remote_fs_observer_impl
   Remote FS observer stderr: File ".vscode/extensions/robocorp.robotframework-lsp-0.23.0/src/robotframework_ls/vendored/robocorp_ls_core/libs/fsnotify_lib/fsnotify/init.py", line 238, in
   lsp: 2021-09-21 12:00:28 UTC pid: 361525 - Thread-1 - INFO - robocorp_ls_core.remote_fs_observer_impl
   Remote FS observer stderr: not self.accepted_file_extensions or path_name.endswith(self.accepted_file_extensions)
   lsp: 2021-09-21 12:00:28 UTC pid: 361525 - Thread-1 - INFO - robocorp_ls_core.remote_fs_observer_impl
   Remote FS observer stderr: TypeError: endswith first arg must be str or a tuple of str, not list

and in said lambda, follow accepted_file_extensions member to see its content, which is () and does not seem to be modified?

Expected behavior
Load the extension without crashing with the same behaviour as precedent versions.

Versions:

• OS: Linux pop-os 5.11.0-7633-generic base Ubuntu 20.04 GNU/Linux
• Robot Framework Version: 4.1.1 (Python 3.8.10 on linux)
• Robot Framework Language Server Version: 0.23
• Client Version: VSCode 1.60.1

Logs
See: https://github.com/robocorp/robotframework-lsp/blob/master/robotframework-ls/docs/reporting_issues.md for details on how to collect the logs.
robot_logs.1.others.lsp.361710.api.log
robot_logs.2.lsp.368418.api.log
robot_logs.lint.lsp.361610.api.log
robot_logs.lsp.361525.log
robot_logs.remote_fs_observer.361565.log

[fabioz]

I'm sorry about that, I've just pushed a new update with a fix for that (0.23.1) as this was really a critical issue.