message: fix test stderr
diff: @@ -1737,7 +1737,7 @@ fn in_virtual_workspace() {
  p.cargo("publish --no-verify --token sekrit")
  .with_status(101)
  - .with_stderr("error: must use `-p` argument in virtual manifest")
  + .with_stderr("error: the `-p` argument must be specified in the root of a virtual workspace")
  .run();
  }
  