[release/6.0] (deps): Bump src/submodules/googletest (#42529)

Bumps [src/submodules/googletest](https://github.com/google/googletest) from `548b13d` to `96f5142`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@548b13d...96f5142)

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

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