bigquery-emulator: refactor

this shouldn't create any rebuilds

pkgs/by-name/bi/bigquery-emulator/package.nix

@@ -4,21 +4,19 @@
   fetchFromGitHub,
   lib,
 }:
-let
-  version = "0.6.6";
-  pname = "bigquery-emulator";
-in
+
 buildGoModule.override
   {
     stdenv = pkgs.clangStdenv;
   }
-  {
-    inherit pname version;
+  (finalAttrs: {
+    version = "0.6.6";
+    pname = "bigquery-emulator";
 
     src = fetchFromGitHub {
       owner = "goccy";
       repo = "bigquery-emulator";
-      tag = "v${version}";
+      tag = "v${finalAttrs.version}";
       hash = "sha256-iAVbxbm1G7FIWTB5g6Ff8h2dZjZssONA2MOCGuvK180=";
     };
 
@@ -29,16 +27,16 @@ buildGoModule.override
       rm -r internal/cmd/generator
     '';
 
-    ldflags = [ "-s -w -X main.version=${version} -X main.revision=v${version}" ];
+    ldflags = [ "-s -w -X main.version=${finalAttrs.version} -X main.revision=v${finalAttrs.version}" ];
 
     doCheck = false;
 
     meta = {
       description = "BigQuery emulator server implemented in Go";
       homepage = "https://github.com/goccy/bigquery-emulator";
-      changelog = "https://github.com/goccy/pname/releases/tag/v${version}";
+      changelog = "https://github.com/goccy/pname/releases/tag/v${finalAttrs.version}";
       license = lib.licenses.mit;
       maintainers = with lib.maintainers; [ tarantoj ];
       mainProgram = "bigquery-emulator";
     };
-  }
+  })