chore(deps): bump gunicorn from 20.1.0 to 22.0.0 in /eventarc/audit_i…

…am (GoogleCloudPlatform#11529)

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 20.1.0 to 22.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@20.1.0...22.0.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-type: direct:production
...

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eventarc/audit_iam/requirements.txt

@@ -1,5 +1,5 @@
 Flask==3.0.0
-gunicorn==20.1.0
+gunicorn==22.0.0
 google-events==0.11.0
 cloudevents==1.10.1
 googleapis-common-protos==1.59.0