PR Checks: use semantic versioning for create-github-app-token

Author: angelapwen

.github/workflows/post-release-mergeback.yml

@@ -168,7 +168,7 @@ jobs:
             --draft
 
       - name: Generate token
-        uses: actions/create-github-app-token@0d564482f06ca65fa9e77e2510873638c82206f2
+        uses: actions/create-github-app-token@v1.11.5
         id: app-token
         with:
           app-id: ${{ vars.AUTOMATION_APP_ID }}

.github/workflows/update-release-branch.yml

@@ -124,7 +124,7 @@ jobs:
       pull-requests: write # needed to create pull request
     steps:
     - name: Generate token
-      uses: actions/create-github-app-token@0d564482f06ca65fa9e77e2510873638c82206f2
+      uses: actions/create-github-app-token@v1.11.5
       id: app-token
       with:
         app-id: ${{ vars.AUTOMATION_APP_ID }}