build(deps): Bump external/benchmark from b2b0aab to f4f93b5

Bumps [external/benchmark](https://github.com/google/benchmark) from `b2b0aab` to `f4f93b5`.
- [Release notes](https://github.com/google/benchmark/releases)
- [Commits](google/benchmark@b2b0aab...f4f93b5)

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

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