chore(nix): Update version to 0.37.0 in default.nix (GH#749)

Version was stuck at 0.30.7. The vendorHash may need updating too -
if build fails with hash mismatch, use the "got:" value from the error.

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

default.nix

@@ -1,14 +1,14 @@
 { pkgs, self }:
 pkgs.buildGoModule {
   pname = "beads";
-  version = "0.30.7";
+  version = "0.37.0";
 
   src = self;
 
   # Point to the main Go package
   subPackages = [ "cmd/bd" ];
   doCheck = false;
-  # Go module dependencies hash (computed via nix build)
+  # Go module dependencies hash - if build fails with hash mismatch, update with the "got:" value
   vendorHash = "sha256-Brzb6HZHYtF8LTkP3uQ21GG72c5ekzSkQ2EdrqkdeO0=";
 
   # Git is required for tests