Remove -Djava.net.preferIPv4Stack=true

The build passes without it, and it was preventing a repl from being successfully launched in my environment.

Author: vemv

project.clj

@@ -77,6 +77,6 @@
              :clj-kondo [:test
                          {:dependencies [[clj-kondo "2021.06.18"]]}]}
 
-  :jvm-opts ~(cond-> ["-Djava.net.preferIPv4Stack=true"]
+  :jvm-opts ~(cond-> []
                (System/getenv "CI")
                (conj "-Drefactor-nrepl.internal.log-exceptions=true")))