[release/6.0] (deps): Bump src/submodules/googletest (#54869)

Bumps [src/submodules/googletest](https://github.com/google/googletest) from `31993df` to `77afe8e`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@31993df...77afe8e)

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

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Author: dependabot[bot]