Bump python-multipart from 0.0.19 to 0.0.20 in /scan

Bumps [python-multipart](https://github.com/Kludex/python-multipart) from 0.0.19 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](Kludex/python-multipart@0.0.19...0.0.20)

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

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

scan/requirements.txt

@@ -2,5 +2,5 @@
 checkdmarc@git+https://github.com/CERT-Polska/checkdmarc@redirect-syntax
 dkimpy==1.1.8
 PyNaCl==1.5.0
-python-multipart==0.0.19
+python-multipart==0.0.20
 validators==0.34.0