Update dependency whitenoise to v5.3.0

Author: renovate-bot

requirements.txt

@@ -15,4 +15,4 @@ pyvalitron==1.1.3
 feedgen==0.9.0
 python-dateutil==2.8.1
 psycopg2-binary==2.8.5
-whitenoise==5.1.0
+whitenoise==5.3.0