Remove all derivations of Typeable

Typeable has been automatically derived for every type since GHC 7.10,
so remove these obsolete derivations.  This also allows us to get rid of
the `DeriveDataTypeable` pragma quite naturally.

Related: https://github.com/xmonad/xmonad/pull/299 (xmonad/xmonad@9e5b16ed8a)
Related: bd5b969d9b
Fixes: https://github.com/xmonad/xmonad-contrib/issues/548

XMonad/Layout/NoBorders.hs

@@ -1,5 +1,5 @@
 {-# LANGUAGE FlexibleContexts, FlexibleInstances, MultiParamTypeClasses #-}
-{-# LANGUAGE PatternGuards, DeriveDataTypeable #-}
+{-# LANGUAGE PatternGuards #-}
 {-# OPTIONS_GHC -Wno-dodgy-imports #-} -- singleton in Data.List since base 4.15
 
 -----------------------------------------------------------------------------
@@ -122,7 +122,6 @@ data BorderMessage
     | ResetBorder Window
         -- ^ Reset the effects of any 'HasBorder' messages on the specified
         -- window.
-    deriving (Typeable)
 
 instance Message BorderMessage