ci: Increase timeout for iOS 26 unit tests

[philipphofmann]

It seems like the macOS 26 runner requires more time to build the tests and to boot the simulator. Therefore, we give it more time before timing out.

#skip-changelog

Closes #6559

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.783%. Comparing base (22af3fc) to head (26ca4cd).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #6558       +/-   ##
=============================================
+ Coverage   85.513%   85.783%   +0.270%     
=============================================
  Files          451       451               
  Lines        27328     27328               
  Branches     11913     11917        +4     
=============================================
+ Hits         23369     23443       +74     
+ Misses        3914      3840       -74     
  Partials        45        45               

see 13 files with indirect coverage changes

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