🦉 Updates from OwlBot post-processor

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

Author: gcf-owl-bot[bot]

.flake8

@@ -30,6 +30,9 @@ exclude =
   # Exclude environment test code.
   tests/environment/**
 
+  # Exclude environment test code.
+  tests/environment/**
+
   # Exclude generated code.
   **/proto/**
   **/gapic/**