build: exclude certain autogenerated files (#1501)

* build: exclude certain autogenerated files

* 🦉 Updates from OwlBot post-processor

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

* update exclude

* typo

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: parthea

owlbot.py

@@ -37,6 +37,11 @@
             "setup.py",
             "noxfile.py",
             "README.rst",
+            # Exclude autogenerated default import `google.cloud.storage`
+            "google/cloud/storage/*",
+            # Exclude autogenerated constraints files for Python 3.7/3.9
+            "testing/constraints-3.7.txt",
+            "testing/constraints-3.9.txt",
         ],
     )
 s.remove_staging_dirs()