Bump gunicorn from 20.1.0 to 22.0.0

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:development
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements-dev.txt

@@ -101,7 +101,7 @@ graphviz==0.17; python_version >= '3.6'
 grpc-google-iam-v1==0.12.3
 grpcio-gcp==0.2.2
 grpcio==1.40.0
-gunicorn==20.1.0; python_version >= '3.5'
+gunicorn==22.0.0; python_version >= '3.5'
 h11==0.12.0; python_version >= '3.6'
 hdfs==2.6.0
 httpcore==0.13.7; python_version >= '3.6'