haskell.compiler.ghc912: 9.12.2 -> 9.12.3

After #490755, the problematic regression has been patched, so we can actually
update. After the fixes for fourmolu and cabal-add, HLS can also be built with
GHC 9.12.3.

pkgs/top-level/haskell-packages.nix

@@ -66,7 +66,7 @@ let
     ghc96 = sets.ghc967;
     ghc98 = sets.ghc984;
     ghc910 = sets.ghc9103;
-    ghc912 = sets.ghc9122;
+    ghc912 = sets.ghc9123;
     ghc914 = sets.ghc9141;
   };
 in

pkgs/top-level/release-haskell.nix

@@ -67,7 +67,6 @@ let
     ghc967
     ghc984
     ghc9103
-    ghc9122 # TODO(@sternenseemann): drop
     ghc9123
   ];
 
@@ -526,7 +525,6 @@ let
       ] released;
       Cabal_3_10_3_0 = lib.subtractLists [
         # time < 1.13 conflicts with time == 1.14.*
-        compilerNames.ghc9122
         compilerNames.ghc9123
       ] released;
       Cabal_3_12_1_0 = released;
@@ -538,7 +536,6 @@ let
       haskell-language-server = released;
       hoogle = released;
       hlint = lib.subtractLists [
-        compilerNames.ghc9122
         compilerNames.ghc9123
       ] released;
       hpack = released;
@@ -551,11 +548,9 @@ let
       ghc-lib-parser = released;
       ghc-lib-parser-ex = released;
       ghc-source-gen = lib.subtractLists [
-        compilerNames.ghc9122
         compilerNames.ghc9123
       ] released;
       ghc-tags = lib.subtractLists [
-        compilerNames.ghc9122
         compilerNames.ghc9123
       ] released;
       hashable = released;
@@ -566,7 +561,6 @@ let
         compilerNames.ghc967
       ];
       weeder = lib.subtractLists [
-        compilerNames.ghc9122
         compilerNames.ghc9123
       ] released;
     })