round: use sri hash

pkgs/applications/graphics/round/default.nix

···
     owner = "mingrammer";
     repo = pname;
     rev = "v${version}";
-    sha256 = "09brjr3h4qnhlidxlki1by5anahxy16ai078zm4k7ryl579amzdw";
+    hash = "sha256-vP2q0inU5zNJ/eiAqEzwHSqril8hTtpbpNBiAkeWeSU=";
   };
 
-  vendorSha256 = null;
+  vendorHash = null;
 
   subPackages = [ "." ];