Update jetty-http2-server to 12.1.5 in series/0.28

Author: http4s-steward[bot]

build.sbt

@@ -30,7 +30,7 @@ lazy val root = project
   .aggregate(jettyServer, jettyServerEe10, jettyClient)
 
 val catsEffectVersion = "3.6.3"
-val jettyVersion = "12.1.4"
+val jettyVersion = "12.1.5"
 val http4sVersion = "0.23.30"
 val http4sServletVersion = "0.25.0-RC1"
 val munitCatsEffectVersion = "2.1.0"