Bump packaging from 20.9 to 21.3 (#533)

Bumps [packaging](https://github.com/pypa/packaging) from 20.9 to 21.3.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/main/CHANGELOG.rst)
- [Commits](pypa/packaging@20.9...21.3)

---
updated-dependencies:
- dependency-name: packaging
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

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

requirements-dev.txt

@@ -17,7 +17,7 @@ monotonic==1.5
 mypy==0.790
 mypy-extensions==0.4.3
 nodeenv==1.6.0
-packaging==20.9
+packaging==21.3
 platformdirs==2.0.2
 pluggy==0.13.1
 pre-commit==2.17.0