Test w/ CMake 4.0 release

[justsmth]

Description of changes:

Update CI to test w/ CMake 4.0 release. (Previously we were testing with a release candidate.)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.90%. Comparing base (c358484) to head (d9d73da).
Report is 195 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #756      +/-   ##
==========================================
- Coverage   95.80%   92.90%   -2.90%     
==========================================
  Files          61       72      +11     
  Lines        8143     9818    +1675     
  Branches        0     9818    +9818     
==========================================
+ Hits         7801     9121    +1320     
- Misses        342      410      +68     
- Partials        0      287     +287     

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