Bump validators from 0.28.3 to 0.30.0 in /scan

Bumps [validators](https://github.com/python-validators/validators) from 0.28.3 to 0.30.0.
- [Release notes](https://github.com/python-validators/validators/releases)
- [Changelog](https://github.com/python-validators/validators/blob/master/CHANGES.md)
- [Commits](python-validators/validators@0.28.3...0.30.0)

---
updated-dependencies:
- dependency-name: validators
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

scan/requirements.txt

@@ -2,4 +2,4 @@
 checkdmarc@git+https://github.com/CERT-Polska/checkdmarc@hotfixes-2024-06-05
 dkimpy==1.1.7
 python-multipart==0.0.9
-validators==0.28.3
+validators==0.30.0