chore(deps): update dependency pytz to v2021.3 (#21)

renovate-bot · web-flow · commit 37179ff0f9ec · 2021-10-04T09:37:45.000-05:00
diff --git a/dev_requirements.txt b/dev_requirements.txt
@@ -4,4 +4,4 @@ future==0.18.2
 
 pytest==6.2.5
 pytest-flake8==1.0.7
-pytz==2021.1
+pytz==2021.3
