build(deps): bump pylint from 2.5.3 to 2.12.2 in /infra/ci

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.5.3 to 2.12.2.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/main/ChangeLog)
- [Commits](pylint-dev/pylint@pylint-2.5.3...v2.12.2)

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

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

infra/ci/requirements.txt

@@ -1,7 +1,7 @@
 # Requirements for submitting code changes to infra/ (needed by presubmit.py).
 parameterized==0.7.4
 pyfakefs==4.5.6
-pylint==2.5.3
+pylint==2.12.2
 pytest==6.2.1
 pytest-xdist==2.5.0
 PyYAML==6.0