Merge branch 'renovate/gunicorn-21.x' into 'main'

chore(deps): update dependency gunicorn to v21

See merge request !14

requirements.txt

 Django==4.2.1
 whitenoise==6.5.0
-gunicorn==20.1.0
\ No newline at end of file
+gunicorn==21.2.0
\ No newline at end of file