Merge pull request #277590 from trofi/devpod-fix-tests-eval

devpod: fix `tests` eval

pkgs/development/tools/devpod/default.nix

···
     '';
 
     passthru.tests.version = testers.testVersion {
-      package = pname;
+      package = devpod;
+      command = "devpod version";
       version = "v${version}";
     };
   };