build(deps): bump third_party/googletest from f3c355f to 504ea69

Bumps [third_party/googletest](https://github.com/google/googletest) from `f3c355f` to `504ea69`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@f3c355f...504ea69)

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

Signed-off-by: dependabot[bot] <[email protected]>