Bump submodules/googletest from 6dae7eb to 71815bb

Bumps [submodules/googletest](https://github.com/google/googletest) from `6dae7eb` to `71815bb`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@6dae7eb...71815bb)

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

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