Merge pull request #418 from OpenPrinting/dependabot/github_actions/actions/checkout-6.0.1

Bump actions/checkout from 6.0.0 to 6.0.1

Author: zdohnal

.github/workflows/differential-shellcheck.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps: 
       - name: Repository checkout
-        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
         with:
           fetch-depth: 0