Update our default Haskell compiler from GHC version 8.10.3 to 8.10.4.

pkgs/development/haskell-modules/configuration-hackage2nix.yaml

@@ -1,6 +1,6 @@
 # pkgs/development/haskell-modules/configuration-hackage2nix.yaml
 
-compiler: ghc-8.10.3
+compiler: ghc-8.10.4
 
 core-packages:
   - array-0.5.4.0
@@ -13,17 +13,17 @@ core-packages:
   - directory-1.3.6.0
   - exceptions-0.10.4
   - filepath-1.4.2.1
-  - ghc-8.10.3
-  - ghc-boot-8.10.3
-  - ghc-boot-th-8.10.3
+  - ghc-8.10.4
+  - ghc-boot-8.10.4
+  - ghc-boot-th-8.10.4
   - ghc-compact-0.1.0.0
-  - ghc-heap-8.10.3
+  - ghc-heap-8.10.4
   - ghc-prim-0.6.1
-  - ghci-8.10.3
+  - ghci-8.10.4
   - haskeline-0.8.0.1
   - hpc-0.6.1.0
   - integer-gmp-1.0.3.0
-  - libiserv-8.10.3
+  - libiserv-8.10.4
   - mtl-2.2.2
   - parsec-3.1.14.0
   - pretty-1.1.3.6

pkgs/top-level/all-packages.nix

@@ -10059,7 +10059,7 @@ in
 
   # Please update doc/languages-frameworks/haskell.section.md, “Our
   # current default compiler is”, if you bump this:
-  haskellPackages = dontRecurseIntoAttrs haskell.packages.ghc8103;
+  haskellPackages = dontRecurseIntoAttrs haskell.packages.ghc8104;
 
   inherit (haskellPackages) ghc;