haskell-hoogle: fix build of latest version

pkgs/development/haskell-modules/configuration-common.nix

···
     unliftio = self.unliftio_0_2_0_0;
   });
 
+  # Hoogle needs a newer version than lts-9 provides.
+  hoogle = super.hoogle.override { haskell-src-exts = self.haskell-src-exts_1_20_1; };
+
 }