Bump redhat-plumbers-in-action/differential-shellcheck

Bumps [redhat-plumbers-in-action/differential-shellcheck](https://github.com/redhat-plumbers-in-action/differential-shellcheck) from 5.1.1 to 5.3.0.
- [Release notes](https://github.com/redhat-plumbers-in-action/differential-shellcheck/releases)
- [Changelog](https://github.com/redhat-plumbers-in-action/differential-shellcheck/blob/main/docs/CHANGELOG.md)
- [Commits](redhat-plumbers-in-action/differential-shellcheck@c150708...60c9f2b)

---
updated-dependencies:
- dependency-name: redhat-plumbers-in-action/differential-shellcheck
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/differential-shellcheck.yml

@@ -32,6 +32,6 @@ jobs:
 
       - id: ShellCheck
         name: Differential ShellCheck
-        uses: redhat-plumbers-in-action/differential-shellcheck@c15070885a82a2c93db8a765d332c38c50dde8b3 # pin@aa647ec4466543e8555c2c3b648124a9813cee44
+        uses: redhat-plumbers-in-action/differential-shellcheck@60c9f2b924a9c5a2ddbb25e7b23e8e11b56faab9 # pin@aa647ec4466543e8555c2c3b648124a9813cee44
         with:
           token: ${{ secrets.GITHUB_TOKEN }}