yodl: fix 'meta.license'

pkgs/by-name/yo/yodl/package.nix

···
     description = "Package that implements a pre-document language and tools to process it";
     homepage = "https://fbb-git.gitlab.io/yodl/";
     mainProgram = "yodl";
-    license = lib.licenses.agpl3Only; # Upstream did not clarify the license used. https://gitlab.com/fbb-git/yodl/-/issues/4
+    license = lib.licenses.agpl3Plus;
     maintainers = with lib.maintainers; [ pSub ];
     platforms = lib.platforms.linux;
   };