scotty: jailbreak

Needed when overriding aeson to the new version, which in turn is needed
if using scotty on a project that also uses lens 4.0.

pkgs/development/libraries/haskell/scotty/default.nix

@@ -17,4 +17,5 @@ cabal.mkDerivation (self: {
     license = self.stdenv.lib.licenses.bsd3;
     platforms = self.ghc.meta.platforms;
   };
+  jailbreak = true;
 })