jikken: add version-regex to updateScript

pkgs/by-name/ji/jikken/package.nix

···
 
   buildInputs = [ openssl ] ++ lib.optionals stdenv.hostPlatform.isDarwin [ apple-sdk_15 ];
 
-  passthru.updateScript = nix-update-script { };
+  passthru.updateScript = nix-update-script {
+    extraArgs = [
+      "--version-regex"
+      "^(v\\d+\\.\\d+\\.\\d+)$"
+    ];
+  };
 
   meta = with lib; {
     description = "Powerful, source control friendly REST API testing toolkit";