Merge pull request #417 from OpenPrinting/dependabot/github_actions/redhat-plumbers-in-action/differential-shellcheck-5.5.6

Bump redhat-plumbers-in-action/differential-shellcheck from 5.5.5 to 5.5.6

Author: zdohnal

.github/workflows/differential-shellcheck.yml

@@ -21,6 +21,6 @@ jobs:
           fetch-depth: 0
 
       - name: Differential ShellCheck
-        uses: redhat-plumbers-in-action/differential-shellcheck@0d9e5b29625f871e6a4215380486d6f1a7cb6cdd
+        uses: redhat-plumbers-in-action/differential-shellcheck@d965e66ec0b3b2f821f75c8eff9b12442d9a7d1e
         with:
           token: ${{ secrets.GITHUB_TOKEN }}