nix: compiler ghc8107 -> ghc947

default.nix

@@ -1,7 +1,7 @@
 {
 # For current default and explicitly supported GHCs https://search.nixos.org/packages?query=ghc&from=0&size=500&channel=unstable, Nixpkgs implicitly supports older minor versions also, until the configuration departs from compatibility with them.
 # Compiler in a form ghc8101 <- GHC 8.10.1, just remove spaces and dots
-  compiler    ? "ghc8107"
+  compiler    ? "ghc947"
 
 # Deafult.nix is a unit package abstraciton that allows to abstract over packages even in monorepos:
 # Example: pass --arg cabalName --arg packageRoot "./subprojectDir", or map default.nix over a list of tiples for subprojects.

flake.nix

@@ -27,7 +27,7 @@
       (system: pkgs: import ./default.nix {
         inherit pkgs;
         withHoogle = true;
-        compiler = "ghc8107";
+        compiler = "ghc947";
         packageRoot = pkgs.runCommand "hnix-src" {} ''
           cp -r ${./.} $out
           chmod -R +w $out

shell.nix

@@ -3,6 +3,6 @@ let defaultAttrs = {
   # Defaults are put in this form deliberately. Details: #748
   withHoogle = true;
   returnShellEnv = true;
-  compiler = "ghc8107";
+  compiler = "ghc947";
 };
 in (import ./. (defaultAttrs // attrs))