chore(ci): Update release-plz.yml (#1542)

Normalize release-plz vars

Author: gtema

.github/workflows/release-plz.yml

@@ -81,8 +81,8 @@ jobs:
         uses: actions/create-github-app-token@7e473efe3cb98aa54f8d4bac15400b15fad77d94 # v2.2.0
         id: generate-token
         with:
-          app-id: ${{ secrets.APP_ID }}
-          private-key: ${{ secrets.APP_PRIVATE_KEY }}
+          app-id: ${{ secrets.RELEASE_PLZ_APP_ID }}
+          private-key: ${{ secrets.RELEASE_PLZ_PRIVATE_KEY }}
           permission-contents: write
           permission-pull-requests: write