fix: update gastown vendorHash for Go module changes

The upstream gastown Go dependencies changed, causing a hash mismatch
in the fixed-output derivation. Updated vendorHash in both:
- packages/gastown/default.nix (flake packages output)
- home/roles/development/default.nix (home-manager inline build)

home/roles/development/default.nix

@@ -32,7 +32,7 @@ let
     pname = "gastown";
     version = "unstable-${gastownRev}";
     src = globalInputs.gastown;
-    vendorHash = "sha256-ripY9vrYgVW8bngAyMLh0LkU/Xx1UUaLgmAA7/EmWQU=";
+    vendorHash = "sha256-/+ODyndArUF0nJY9r8G5JKhzQckBHFb48A7EBZmoIr0=";
     subPackages = [ "cmd/gt" ];
     doCheck = false;
 

packages/gastown/default.nix

@@ -9,7 +9,7 @@
 buildGoModule {
   pname = "gastown";
   inherit version src;
-  vendorHash = "sha256-ripY9vrYgVW8bngAyMLh0LkU/Xx1UUaLgmAA7/EmWQU=";
+  vendorHash = "sha256-/+ODyndArUF0nJY9r8G5JKhzQckBHFb48A7EBZmoIr0=";
   subPackages = [ "cmd/gt" ];
   doCheck = false;