chore: update Node version to v24

[susnux]

files v4 will only support Nextcloud 33+, so we only need to support Node 24 (and probably later Node 26 once released).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.47%. Comparing base (91587cb) to head (b16be5b).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1430   +/-   ##
=======================================
  Coverage   89.47%   89.47%           
=======================================
  Files          25       25           
  Lines         703      703           
  Branches      194      194           
=======================================
  Hits          629      629           
  Misses         62       62           
  Partials       12       12           

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