Remove use of deprecated mypy option

hauntsaninja · web-flow · commit d8dfd746c2e3 · 2022-08-24T22:19:59.000-07:00
`show_none_errors` is deprecated, see python/mypy#13507
diff --git a/mypy.ini b/mypy.ini
@@ -1,5 +1,4 @@
 [mypy]
 # follow_imports = False
 ignore_missing_imports = True
-show_none_errors = True
 strict_optional = True
