Merge pull request #947 from http4s/update/series/0.5/jetty-http2-client-12.1.9

Update jetty-http2-client, ... to 12.1.9 in series/0.5

Author: hamnis

build.sbt

@@ -21,7 +21,7 @@ inThisBuild(
 
 val http4sVersion = "0.23.34"
 
-val jetty = "12.1.8"
+val jetty = "12.1.9"
 
 val netty = "4.1.134.Final"