Bump packaging from 21.0 to 21.3 (#1565)

Bumps [packaging](https://github.com/pypa/packaging) from 21.0 to 21.3.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pypa/packaging/compare/21.0...21.3)

---
updated-dependencies:
- dependency-name: packaging
  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>

[skip ci]

requirements.txt

@@ -25,7 +25,7 @@ Mako==1.1.5
 MarkupSafe==2.0.1
 musicbrainzngs==0.7.1
 oauthlib==3.1.1
-packaging==21.0
+packaging==21.3
 paho-mqtt==1.6.1
 plexapi==4.7.2
 portend==3.0.0