ci: use CLOUD_JAVA_BOT_GITHUB_TOKEN

The old secret has been deleted. Let's use the new one.

b/509523021

Author: suztomo

.github/workflows/hermetic_library_generation.yaml

@@ -36,10 +36,10 @@ jobs:
       if: env.SHOULD_RUN == 'true'
       with:
         fetch-depth: 0
-        token: ${{ secrets.CLOUD_JAVA_BOT_TOKEN }}
+        token: ${{ secrets.CLOUD_JAVA_BOT_GITHUB_TOKEN }}
     - uses: googleapis/google-cloud-java/sdk-platform-java/.github/scripts@v1.85.0
       if: env.SHOULD_RUN == 'true'
       with:
         base_ref: ${{ github.base_ref }}
         head_ref: ${{ github.head_ref }}
-        token: ${{ secrets.CLOUD_JAVA_BOT_TOKEN }}
+        token: ${{ secrets.CLOUD_JAVA_BOT_GITHUB_TOKEN }}