Merge pull request #881 from http4s/update/series/0.5/jetty-http2-client-12.1.5

Update jetty-http2-client, ... to 12.1.5 in series/0.5

Author: hamnis

build.sbt

@@ -21,7 +21,7 @@ inThisBuild(
 
 val http4sVersion = "0.23.33"
 
-val jetty = "12.1.4"
+val jetty = "12.1.5"
 
 val netty = "4.1.128.Final"