Fix 3.10 action

oschwald · oschwald · commit 6a2482b15ece · 2023-01-17T13:40:54.000-08:00
setup.cfg is ini, not YAML or TOML.
diff --git a/setup.cfg b/setup.cfg
@@ -19,7 +19,7 @@ python =
     3.7: py37
     3.8: py38
     3.9: py39
-    "3.10": py310,black,lint,flake8,mypy
+    3.10: py310,black,lint,flake8,mypy
 
 [testenv:{py37,py38,py39,py310}-test]
 deps =
