chore: modify .github/workflows/validate-pr-title.yml

Author: stoat-tofu[bot]

.github/workflows/validate-pr-title.yml

@@ -1,3 +1,6 @@
+# DO NOT EDIT DIRECTLY IN REPOSITORY
+# Managed in Terraform templates
+
 name: "Lint PR"
 
 on:
@@ -15,6 +18,6 @@ jobs:
     permissions:
       pull-requests: read
     steps:
-      - uses: amannn/action-semantic-pull-request@v6
+      - uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6.1.1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}