chore(nix): update vendorHash for all Go dependency updates

Updated vendorHash after merging all Go dependency bumps:
- cobra 1.10.1 → 1.10.2
- x/term 0.37.0 → 0.38.0
- go-sqlite3 0.30.1 → 0.30.3
- anthropic-sdk 1.18.1 → 1.19.0

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

default.nix

@@ -9,7 +9,7 @@ pkgs.buildGoModule {
   subPackages = [ "cmd/bd" ];
   doCheck = false;
   # Go module dependencies hash (computed via nix build)
-  vendorHash = "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";
+  vendorHash = "sha256-ha3sFcbr3fGrHVtSnbrDut/DAnCEy3uGtrcQAozAFJs=";
 
   # Git is required for tests
   nativeBuildInputs = [ pkgs.git ];