[release/6.0] (deps): Bump src/submodules/googletest (#41000)

Bumps [src/submodules/googletest](https://github.com/google/googletest) from `c9461a9` to `af29db7`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@c9461a9...af29db7)

---
updated-dependencies:
- dependency-name: src/submodules/googletest
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]