ci: drop unnecessary permissions and ping GitHub Action to the major version tag

GitHub-Actions.md

@@ -19,10 +19,6 @@ jobs:
   test:
     runs-on: ubuntu-latest
 
-    permissions:
-      security-events: write
-      pull-requests: write
-
     steps: 
       - name: Repository checkout
         uses: actions/checkout@v3
@@ -30,7 +26,8 @@ jobs:
           fetch-depth: 0
 
       - name: Differential ShellCheck
-        uses: redhat-plumbers-in-action/differential-shellcheck@latest
+        uses: redhat-plumbers-in-action/differential-shellcheck@v3
         with:
+          severity: warning
           token: ${{ secrets.GITHUB_TOKEN }}
 ```