build(deps): bump anchore/scan-action from 3 to 4

Bumps [anchore/scan-action](https://github.com/anchore/scan-action) from 3 to 4.
- [Release notes](https://github.com/anchore/scan-action/releases)
- [Changelog](https://github.com/anchore/scan-action/blob/main/CHANGELOG.md)
- [Commits](anchore/scan-action@v3...v4)

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

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

.github/workflows/ci.yml

@@ -555,7 +555,7 @@ jobs:
           make docker-build
           make docker-test CI=true UNSTRUCTURED_INCLUDE_DEBUG_METADATA=true
       - name: Scan image
-        uses: anchore/scan-action@v3
+        uses: anchore/scan-action@v4
         with:
           image: "unstructured:dev"
           severity-cutoff: critical