Bump submodules/googletest from 76bb2af to b3a9ba2 (#3997)

Bumps [submodules/googletest](https://github.com/google/googletest) from `76bb2af` to `b3a9ba2`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@76bb2af...b3a9ba2)

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

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