chore: revert: switch release please secret to use adk-java-releases-bot's token

Release-As: 0.8.0
PiperOrigin-RevId: 879555202

Author: tilgalas

.github/workflows/release-please.yaml

@@ -14,4 +14,4 @@ jobs:
     steps:
       - uses: googleapis/release-please-action@v4
         with:
-          token: ${{ secrets.RELEASE_PLEASE_TOKEN }}
+          token: ${{ secrets.GITHUB_TOKEN }}