[release/9.0] (deps): Bump src/submodules/googletest (#64230)

Bumps [src/submodules/googletest](https://github.com/google/googletest) from `9706f75` to `6ec14df`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@9706f75...6ec14df)

---
updated-dependencies:
- dependency-name: src/submodules/googletest
  dependency-version: 6ec14dfd8c409d05fba94e18e3a02df35b874353
  dependency-type: direct:production
...

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Author: dependabot[bot]