cucumber: add anthonyroussel to maintainers

pkgs/development/tools/cucumber/default.nix

···
     homepage = "https://cucumber.io/";
     changelog = "https://github.com/cucumber/cucumber-ruby/blob/main/CHANGELOG.md";
     license = licenses.mit;
-    maintainers = with maintainers; [ manveru nicknovitski ];
+    maintainers = with maintainers; [ manveru nicknovitski anthonyroussel ];
     platforms = platforms.unix;
   };
 }