Bump googletest from 7d76a23 to 504ea69

Bumps [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: googletest
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>