Update noxfile.py

Co-authored-by: Torsten Kilias <[email protected]>

noxfile.py

@@ -23,7 +23,7 @@ def generate_api(session: Session):
     https://docs.github.com/en/actions/learn-github-actions/variables.
     #default-environment-variables.
     """
-    silent = False if os.environ.get("CI") else True
+    silent = "CI" in os.environ
     session.run(
         "openapi-python-client",
         "update",