Comments explaining why keyboard and tzlocal are not run on multiple platforms (#9188)

stubs/keyboard/METADATA.toml

@@ -2,3 +2,8 @@ version = "0.13.*"
 
 [tool.stubtest]
 ignore_missing_stub = false
+# While the stubs slightly differ on Windows vs Linux.
+# It's only by possible mouse buttons and event literal types.
+# As well as returning a tuple of int/long from keyboard.mouse.get_position
+# The "mouse" module is obsoleted by the "mouse" package.
+# platforms =