Replace tibdex/github-app-token with actions/create-github-app-token (#10062) (#11685)

Author: mergify[bot]

.github/workflows/serverless-project.yml

@@ -23,18 +23,15 @@ jobs:
       ####################################
       - name: Get token
         id: get_token
-        uses: tibdex/github-app-token@3beb63f4bd073e61482598c45c71c1019b59b73a # v2.1.0
+        uses: actions/create-github-app-token@v2
         with:
-          app_id: ${{ secrets.OBS_AUTOMATION_APP_ID }}
-          private_key: ${{ secrets.OBS_AUTOMATION_APP_PEM }}
-          permissions: >-
-            {
-              "checks": "read",
-              "contents": "write",
-              "pull_requests": "write"
-            }
-          repositories: >-
-            ["observability-test-environments"]
+          app-id: ${{ secrets.OBS_AUTOMATION_APP_ID }}
+          private-key: ${{ secrets.OBS_AUTOMATION_APP_PEM }}
+          permission-checks: read
+          permission-contents: write
+          permission-pull-requests: write
+          repositories: |
+            observability-test-environments
 
       - uses: elastic/oblt-actions/git/setup@v1
         with: