Bump more-itertools from 8.11.0 to 8.12.0 in /tests (#2209)

Bumps [more-itertools](https://github.com/more-itertools/more-itertools) from 8.11.0 to 8.12.0.
- [Release notes](https://github.com/more-itertools/more-itertools/releases)
- [Commits](more-itertools/more-itertools@v8.11.0...v8.12.0)

---
updated-dependencies:
- dependency-name: more-itertools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

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

tests/requirements.txt

@@ -10,7 +10,7 @@ certifi==2021.10.8
 urllib3==1.26.7
 pytest-html==3.1.1
 pytest-profiling==1.7.0
-more-itertools==8.11.0
+more-itertools==8.12.0
 mock==4.0.3
 grpcio==1.42.0
 grpcio-tools==1.42.0