[various] Upgrade googletest to v1.15.2

[Gustl22]

Running e.g. pigeon tests (packages\pigeon\tool\test.dart) with Visual Studio 2026 gives the following error:

##############################
# Generating platform_test/ output [start time 22:58:25]
Generation complete!
##############################
# Running windows_unittests [start time 22:58:29]
Building Windows application...                                 
CMake Error at D:/Tmp/Coding/git/flutter/packages/packages/pigeon/platform_tests/test_plugin/example/build/windows/x64/_deps/googletest-src/CMakeLists.txt:4 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.


Building Windows application...                                     6,9s
Unable to generate build files
# Failed, exit code: 1

Process finished with exit code 1

So upgrading the google tools to v1.15.2 resolves that issue as since 1.12.1 the minimum required CMake version is 3.5.

Towards flutter/flutter#185597

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[gemini-code-assist]

Code Review

This pull request updates the googletest dependency version from 1.11.0 to 1.15.2 in the CMakeLists.txt files for the camera, file_selector, local_auth, pigeon, and url_launcher packages. I have no feedback to provide.

[gemini-code-assist]

Code Review

This pull request updates the googletest version to 1.15.2 across several packages, including camera_windows, file_selector, local_auth, pigeon, and url_launcher. Feedback indicates that a CHANGELOG.md entry should be added for the changes made to the pigeon package's test infrastructure.

[gemini-code-assist]

The changes to the test infrastructure in the pigeon package should be accompanied by a CHANGELOG.md entry, consistent with the other packages updated in this pull request (such as camera_windows and file_selector_linux).

References

1. Every change to a package must be accompanied by a version bump and a CHANGELOG entry.

[Gustl22]

Pigeons test_plugin is not published and also doesn't provide a Changelog file.

[stuartmorgan-g]

We don't do changelog entries for test-only changes.

[stuartmorgan-g]

version exempt: test only

[Gustl22]

We don't do changelog entries for test-only changes.

All right, I thought they are necessary, because they are part of the released package. Reverted them...

[stuartmorgan-g]

LGTM

@tarrinneal for a second approval