chore(deps): allow @nextcloud/files v3 and v4

[susnux]

This adds support for Nextcloud 33+.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.65%. Comparing base (620674e) to head (49f7cc4).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #158   +/-   ##
=======================================
  Coverage   95.65%   95.65%           
=======================================
  Files           4        4           
  Lines          69       69           
  Branches       26       26           
=======================================
  Hits           66       66           
  Misses          3        3           

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