Use github:stable-haskell/ghc/stable-ghc-9.14

Author: hamishmack

lazy-inputs/ghc914X/flake.lock

@@ -4,7 +4,7 @@
   inputs = {
     ghc914X = {
       flake = false;
-      url = "git+https://gitlab.haskell.org/ghc/ghc?ref=ghc-9.14&submodules=1";
+      url = "git+https://github.com/stable-haskell/ghc?ref=stable-ghc-9.14&submodules=1";
     };
   };