Bump gunicorn from 20.0.4 to 22.0.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 20.0.4 to 22.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@20.0.4...22.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -27,7 +27,7 @@ google-cloud-storage==1.28.1
 google-cloud-translate==2.0.1
 googlemaps==4.4.0
 graphene-sqlalchemy==2.2.2
-gunicorn==20.0.4
+gunicorn==22.0.0
 newrelic==5.12.1.141
 numpy==1.18.4
 openpyxl==3.0.3