Bump packaging from 20.4 to 20.9

Bumps [packaging](https://github.com/pypa/packaging) from 20.4 to 20.9.
- [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/20.4...20.9)

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

requirements-indirect.txt

@@ -11,7 +11,7 @@ gitdb2==4.0.2
 mccabe==0.6.1
 more-itertools==8.6.0; python_version >= '3.5'
 more-itertools==5.0.0; python_version < '3.5'
-packaging==20.4
+packaging==20.9
 pluggy==0.13.1
 py==1.9.0
 pycodestyle==2.6.0