Switch tox to 3.10 (#337)

Hopefully that makes dependabot happier?

Author: Qalthos

.github/workflows/tox-linters.yml

@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
-        - 3.9
+        - "3.10"
         os:
         - ubuntu-latest
         toxenv: