chore(deps): Bump anchore/scan-action from 5.3.0 to 6.0.0

Bumps [anchore/scan-action](https://github.com/anchore/scan-action) from 5.3.0 to 6.0.0.
- [Release notes](https://github.com/anchore/scan-action/releases)
- [Changelog](https://github.com/anchore/scan-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/anchore/scan-action/compare/v5.3.0...v6.0.0)

---
updated-dependencies:
- dependency-name: anchore/scan-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/generic_vulnerability-scan.yml

@@ -55,7 +55,7 @@ jobs:
           provenance: false
 
       - name: 'Run the Anchore Grype scan action'
-        uses: anchore/scan-action@v5.3.0
+        uses: anchore/scan-action@v6.0.0
         id: scan
         with:
           image: mailserver-testing:ci