Bump tests/gtest from 8a6feab to e47544a (#163)

Bumps [tests/gtest](https://github.com/google/googletest) from `8a6feab` to `e47544a`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@8a6feab...e47544a)

---
updated-dependencies:
- dependency-name: tests/gtest
  dependency-type: direct:production
...

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