use v3 checkout?

Author: blaiseper

.github/workflows/docker-tests.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Run ShellCheck
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v3
         run: find . -type f -name "*.sh" -exec shellcheck {} +
 
   tests:
@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3
 
       - name: Install Platform
         run: |