Bump gunicorn from 21.0.1 to 21.2.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 21.0.1 to 21.2.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@21.0.1...21.2.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -8,4 +8,4 @@ uvloop==0.17.0
 aiocache==0.11.1
 ujson==5.8.0
 Authlib==1.2.1
-gunicorn==21.0.1
+gunicorn==21.2.0

setup.py

@@ -41,7 +41,7 @@
         "Authlib==1.2.1",
         "aiohttp-cors==0.7.0",
         "jsonschema==4.18.3",
-        "gunicorn==21.0.1",
+        "gunicorn==21.2.0",
         "uvloop==0.17.0",
         "cyvcf2==0.30.22",
         "aiocache==0.11.1",