docs: Update app maintainers

[ChristophWurst]

To align with nextcloud/groupware#86.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.47%. Comparing base (9d1688c) to head (73b1758).
Report is 47 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6467   +/-   ##
=========================================
  Coverage     23.47%   23.47%           
- Complexity      453      454    +1     
=========================================
  Files           247      247           
  Lines         11712    11708    -4     
  Branches       2222     2212   -10     
=========================================
  Hits           2749     2749           
+ Misses         8643     8639    -4     
  Partials        320      320           

Flag	Coverage Δ
javascript	15.05% <ø> (ø)
php	59.42% <ø> (+0.10%)	⬆️

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[ChristophWurst]

/backport to stable5.0

[backportbot]

The backport to stable5.0 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable5.0
git pull origin stable5.0

# Create the new backport branch
git checkout -b backport/6467/stable5.0

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 73b1758b

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/6467/stable5.0

Error: No changes found in backport branch

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.