Update ring-core dependency to 1.15.3

Author: bastelfreak

project.clj

@@ -7,7 +7,7 @@
                  [org.clojure/tools.macro "0.2.1"]
                  [clout "2.2.1"]
                  [dev.weavejester/medley "1.9.0"]
-                 [ring/ring-core "1.15.1"]
+                 [ring/ring-core "1.15.3"]
                  [ring/ring-codec "1.3.0"]]
   :plugins [[lein-codox "0.10.8"]]
   :codox