dep: rollback cats-effect and turn off xfatal for it

We currently have a mess of different versions and because of it
cats-effect is using something deprecated in cats. However we can't
bump everything due to other issues, so for a temporary fix try
turning off xfatal for htpp4s.

Author: ckipp01

community-build/community-projects/cats-effect-3

@@ -752,7 +752,7 @@ object projects:
 
   lazy val http4s = SbtCommunityProject(
     project = "http4s",
-    sbtTestCommand = "tests/test; server/test; client/test; ember-core/test; ember-server/test; ember-client/test; circe/test",
+    sbtTestCommand = """set ThisBuild/scalacOptions -= "-Xfatal-warnings"; tests/test; server/test; client/test; ember-core/test; ember-server/test; ember-client/test; circe/test""",
     sbtPublishCommand = "publishLocal",
     scalacOptions = SbtCommunityProject.scalacOptions.filter(_ != "-Ysafe-init"),
     dependencies = List(cats, catsEffect3, fs2, disciplineMunit, scalacheckEffect)