Bump min Python version in comments for typechecker configs

Author: abravalheri

Diff for: mypy.ini

@@ -20,7 +20,7 @@ disable_error_code =
 
 # CI should test for all versions, local development gets hints for oldest supported
 # But our testing setup doesn't allow passing CLI arguments, so local devs have to set this manually.
-# python_version = 3.8
+# python_version = 3.9
 
 exclude = (?x)(
 	# Avoid scanning Python files in generated folders

Diff for: pyrightconfig.json

@@ -11,7 +11,7 @@
 		"setuptools/_distutils",
 	],
 	// Our testing setup doesn't allow passing CLI arguments, so local devs have to set this manually.
-	// "pythonVersion": "3.8",
+	// "pythonVersion": "3.9",
 	// For now we don't mind if mypy's `type: ignore` comments accidentally suppresses pyright issues
 	"enableTypeIgnoreComments": true,
 	"typeCheckingMode": "basic",