chore(functions/tips-gcp-apis):update sample to use functions framework signature (#8985)

Author: Kenneth Rosario

functions/tips-gcp-apis/main.py

@@ -16,13 +16,15 @@
 # [START functions_tips_gcp_apis]
 import os
 
+import functions_framework
 from google.cloud import pubsub_v1
 
 
 # Create a global Pub/Sub client to avoid unneeded network activity
 pubsub = pubsub_v1.PublisherClient()
 
 
+@functions_framework.http
 def gcp_api_call(request):
     """
     HTTP Cloud Function that uses a cached client library instance to

functions/tips-gcp-apis/requirements.txt

@@ -1 +1,2 @@
 google-cloud-pubsub==2.9.0
+functions-framework==3.2.1