fix python test path

Author: chingor13

sdk-platform-java/.cloudbuild/library_generation/cloudbuild-library-generation-integration-test.yaml

@@ -110,7 +110,7 @@ steps:
     source .venv/bin/activate
     pip install --require-hashes -r requirements.txt
     python -m unittest integration_tests.py
-  dir: ".cloudbuild/library_generation/scripts"
+  dir: "sdk-platform-java/.cloudbuild/library_generation/scripts"
   id: verify-generation
   waitFor: ["generate-libraries"]
 options: