ci: update differential-shellcheck

See also: redhat-plumbers-in-action/differential-shellcheck#215

Author: YHNdnzj

.github/workflows/differential-shellcheck.yml

@@ -1,5 +1,8 @@
 name: Differential ShellCheck
 on:
+  push:
+    branches:
+      - master
   pull_request:
     branches:
       - master
@@ -11,13 +14,16 @@ jobs:
   lint:
     runs-on: ubuntu-latest
 
+    permissions:
+      security-events: write
+
     steps:
       - name: Repository checkout
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
       - name: Differential ShellCheck
-        uses: redhat-plumbers-in-action/differential-shellcheck@latest
+        uses: redhat-plumbers-in-action/differential-shellcheck@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}