Bump external/googletest from e4fdb87 to 77afe8e (#252)

Bumps [external/googletest](https://github.com/google/googletest) from `e4fdb87` to `77afe8e`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@e4fdb87...77afe8e)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>