[release/9.0] (deps): Bump src/submodules/googletest (#64580)

Bumps [src/submodules/googletest](https://github.com/google/googletest) from `6ec14df` to `1b96fa1`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@6ec14df...1b96fa1)

---
updated-dependencies:
- dependency-name: src/submodules/googletest
  dependency-version: 1b96fa13f549387b7549cc89e1a785cf143a1a50
  dependency-type: direct:production
...

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Author: dependabot[bot]