Fix deprecation warning in benchmark

[azeey]

🦟 Bug fix

Summary

benchmark::internal::Benchmark was deprecated in google/benchmark#2101 which was released as 1.9.5

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[azeey]

@Mergifyio backport gz-sim10 gz-sim9 gz-sim8 ign-gazebo6

[mergify]

backport gz-sim10 gz-sim9 gz-sim8 ign-gazebo6

✅ Backports have been created

Details

• #3297 Fix deprecation warning in benchmark (backport #3296) has been created for branch gz-sim10
• #3298 Fix deprecation warning in benchmark (backport #3296) has been created for branch gz-sim9
• #3299 Fix deprecation warning in benchmark (backport #3296) has been created for branch gz-sim8
• #3300 Fix deprecation warning in benchmark (backport #3296) has been created for branch ign-gazebo6 but encountered conflicts

Cherry-pick of 8edb19f has failed:

On branch mergify/bp/ign-gazebo6/pr-3296
Your branch is up to date with 'origin/ign-gazebo6'.

You are currently cherry-picking commit 8edb19f8.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   test/benchmark/each.cc

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   test/benchmark/CMakeLists.txt

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally