Update core interface files GHC to 8.10.3

This doesn't work yet. I can't run the script to update the materialized
files as the docs say, it fails with a stack overflow...

build.nix

@@ -18,6 +18,7 @@ let
   tool = buildHaskell.tool;
 in rec {
   tests = import ./test/default.nix { inherit pkgs ifdLevel compiler-nix-name; };
+  inherit haskell;
 
   tools = pkgs.lib.optionalAttrs (ifdLevel >= 3) (
     pkgs.recurseIntoAttrs {

ci.nix

@@ -29,7 +29,7 @@
       ghc884 = true;
       ghc8102 = false;
       ghc8103 = true;
-      ghc810220201118 = false;
+      ghc810320210119 = false;
     });
   systems = nixpkgs: nixpkgs.lib.filterAttrs (_: v: builtins.elem v supportedSystems) {
     # I wanted to take these from 'lib.systems.examples', but apparently there isn't one for linux!
@@ -43,7 +43,7 @@
     in lib.optionalAttrs (nixpkgsName == "R2009" && (__elem compiler-nix-name ["ghc865" "ghc884"])) {
     inherit (lib.systems.examples) ghcjs;
   } // lib.optionalAttrs (system == "x86_64-linux" && (
-         (nixpkgsName == "R2009" && __elem compiler-nix-name ["ghc8101" "ghc8102" "ghc8103" "ghc810220201118"])
+         (nixpkgsName == "R2009" && __elem compiler-nix-name ["ghc8101" "ghc8102" "ghc8103" "ghc810320210119"])
       || (nixpkgsName == "R2003" && __elem compiler-nix-name ["ghc865"]))) {
     # Windows cross compilation is currently broken on macOS
     inherit (lib.systems.examples) mingwW64;