Bump actions/create-github-app-token from 2.2.1 to 3.0.0 (#279)

Author: daniel-zullo-frequenz

.github/workflows/repo-config-migration.yaml

@@ -42,7 +42,7 @@ jobs:
     steps:
       - name: Generate token
         id: create-app-token
-        uses: actions/create-github-app-token@29824e69f54612133e76f7eaac726eef6c875baf # v2.2.1
+        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859 # v3.0.0
         with:
           app-id: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_ID }}
           private-key: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_PRIVATE_KEY }}