devShells/flora: update ghc to 9.10

nix/devShells/flora.nix

@@ -4,7 +4,7 @@
 let
   sources = import ../sources.nix;
 in
-  {pkgs ? import sources.nixpkgs-unstable {}}:
+  {pkgs ? import sources.pin-florashell {}}:
     pkgs.mkShell (let
       libs = with pkgs; [
         zlib
@@ -12,25 +12,24 @@ in
         libsodium
       ];
 
-      fourmolu = let
-        pkgs = import sources.pin-fourmolu {};
-      in
-        with pkgs; let
-          hlib = haskell.lib;
-          fourmolu = haskell.packages.ghc910.callHackage "fourmolu" "0.17.0.0" {};
-        in
-          hlib.dontCheck (hlib.doJailbreak fourmolu);
+      hlib = pkgs.haskell.lib;
+
+      callHackage = {name, version}:
+        let pkg = pkgs.haskell.packages.ghc910.callHackage name version {};
+         in hlib.dontCheck (hlib.doJailbreak pkg);
     in {
       name = "flora";
       packages = with pkgs;
-        [
-          haskellPackages.postgresql-migration
-          fourmolu
-          haskellPackages.hlint
-          haskellPackages.apply-refact
+      let
+        haskellPackages = haskell.packages.ghc910;
+      in
+        # These don't build directly and need to be pinned
+        map callHackage [
+          {name = "fourmolu"; version = "0.17.0.0";}
+          {name = "postgresql-migration"; version = "0.2.1.8";}
+        ]
+        ++ [
           haskellPackages.ghcid
-          haskellPackages.ghc-tags
-
           haskellPackages.cabal-fmt
           haskellPackages.cabal-install
           haskellPackages.ghc

nix/sources.json

@@ -103,6 +103,18 @@
         "url": "https://github.com/NixOS/nixpkgs/archive/7282cb574e0607e65224d33be8241eae7cfe0979.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "pin-florashell": {
+        "branch": "nixos-25.05",
+        "description": "Nix Packages collection",
+        "homepage": null,
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "7282cb574e0607e65224d33be8241eae7cfe0979",
+        "sha256": "0klkpy7ah033y3cwj51a0l96lwmkqqvwgfv3kid4z9x5g2rqr0l5",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/7282cb574e0607e65224d33be8241eae7cfe0979.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "nixpkgs-unstable": {
         "branch": "nixos-unstable",
         "description": "Nix Packages collection & NixOS",