Drop Nextcloud 25 support

[hamza221]

Fixes #3776

[hamza221]

/backport to stable5.5

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (08d6871) 2.51% compared to head (7839145) 2.51%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #3777   +/-   ##
=====================================
  Coverage   2.51%   2.51%           
=====================================
  Files         89      89           
  Lines       4411    4411           
  Branches    1126    1126           
=====================================
  Hits         111     111           
  Misses      4180    4180           
  Partials     120     120           

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[ChristophWurst]

If 26 is PHP8.0+, PHP7.4 can go next :)

[ChristophWurst]

The 25 jobs have to be removed from the protection of main manually at https://github.com/nextcloud/contacts/settings/branches. Make sure to add any new jobs added through the adjusted matrix. Required jobs ensure that Github doesn't merge PRs before all checks have passed.

In the future we can also migrate this repo to use a summary workflow. This is a virtual job that can be referenced from branch protection and doesn't change when the matrix changes.