Bump submodules/googletest from 7d76a23 to 504ea69 (#4742)

Bumps [submodules/googletest](https://github.com/google/googletest) from `7d76a23` to `504ea69`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@7d76a23...504ea69)

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

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