helmfile: Fix version string

pkgs/applications/networking/cluster/helmfile/default.nix

···
 
   subPackages = [ "." ];
 
-  ldflags = [ "-s" "-w" "-X github.com/helmfile/helmfile/pkg/app/version.Version=${version}" ];
+  ldflags = [ "-s" "-w" "-X go.szostok.io/version.version=v${version}" ];
 
   nativeBuildInputs = [ installShellFiles ];