ci: Increase timeout iOS 26 unit tests

[philipphofmann]

Increased the timeout to 40 minutes because just building the tests often takes 20 minutes.

#skip-changelog

Closes #6655

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.163%. Comparing base (a4e1541) to head (816a905).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #6654       +/-   ##
=============================================
+ Coverage   84.960%   85.163%   +0.202%     
=============================================
  Files          452       452               
  Lines        27668     27668               
  Branches     12115     12119        +4     
=============================================
+ Hits         23507     23563       +56     
+ Misses        4113      4059       -54     
+ Partials        48        46        -2     

see 9 files with indirect coverage changes

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