skip tests that don't work on ghc 9

Author: hamishmack

test/index-state/default.nix

@@ -1,5 +1,5 @@
 # Test a package set
-{ stdenv, lib, testSrc, tool, compiler-nix-name, buildPackages }:
+{ stdenv, lib, testSrc, tool, compiler-nix-name }:
 
 with lib;
 
@@ -39,8 +39,7 @@ in
     meta.platforms = platforms.all;
     # This test will need to be updated to use newer hackage index-state for it
     # to work with GHC 9 and above.
-    meta.disabled = builtins.compareVersions
-      buildPackages.haskell-nix.compiler.${compiler-nix-name}.version "9.0" >= 0;
+    meta.disabled = compiler-nix-name == "ghc901";
 
 
     passthru = {