Fix for gi-gtk test

Author: hamishmack

test/gi-gtk/default.nix

@@ -8,12 +8,8 @@ let
     inherit compiler-nix-name evalPackages;
     src = testSrc "gi-gtk";
     cabalProjectLocal = builtins.readFile ../cabal.project.local + ''
-      -- haskell-gi 0.26.12 breaks gi-gtkpixbuf
-      index-state: 2024-09-30T00:00:00Z
       -- The overloading feature of haskell-gi makes build times very long
       constraints: haskell-gi-overloading ==0.0
-      if impl(ghc >=9.11)
-        constraints: filepath source
     '';
   };