chore: use gapic-generator-python 1.3.1 (#284)

* chore: use gapic-generator-python 1.3.1

PiperOrigin-RevId: 472772457

Source-Link: googleapis/googleapis@855b74d

Source-Link: googleapis/googleapis-gen@b64b1e7
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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packages/google-analytics-data/tests/unit/gapic/data_v1alpha/test_alpha_analytics_data.py

@@ -18,8 +18,8 @@
 # try/except added for compatibility with python < 3.8
 try:
     from unittest import mock
-    from unittest.mock import AsyncMock
-except ImportError:
+    from unittest.mock import AsyncMock  # pragma: NO COVER
+except ImportError:  # pragma: NO COVER
     import mock
 
 import grpc

packages/google-analytics-data/tests/unit/gapic/data_v1beta/test_beta_analytics_data.py

@@ -18,8 +18,8 @@
 # try/except added for compatibility with python < 3.8
 try:
     from unittest import mock
-    from unittest.mock import AsyncMock
-except ImportError:
+    from unittest.mock import AsyncMock  # pragma: NO COVER
+except ImportError:  # pragma: NO COVER
     import mock
 
 import grpc