Bump gunicorn from 20.0.4 to 20.1.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 20.0.4 to 20.1.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@20.0.4...20.1.0)

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

requirements.txt

@@ -26,7 +26,7 @@ GeoAlchemy2==0.8.4
 geojson==1.3.4
 glob2==0.7
 greenlet==0.4.17
-gunicorn==20.0.4
+gunicorn==20.1.0
 idna==2.10
 itsdangerous==1.1.0
 Jinja2==2.11.3