Bump python-multipart from 0.0.12 to 0.0.20 in /docker/main

Bumps [python-multipart](https://github.com/Kludex/python-multipart) from 0.0.12 to 0.0.20.
- [Release notes](https://github.com/Kludex/python-multipart/releases)
- [Changelog](https://github.com/Kludex/python-multipart/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Kludex/python-multipart/compare/0.0.12...0.0.20)

---
updated-dependencies:
- dependency-name: python-multipart
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

docker/main/requirements-wheels.txt

@@ -11,7 +11,7 @@ imutils == 0.5.*
 joserfc == 1.0.*
 pathvalidate == 3.2.*
 markupsafe == 3.0.*
-python-multipart == 0.0.12
+python-multipart == 0.0.20
 # General
 mypy == 1.6.1
 onvif-zeep-async == 3.1.*