reverting jetty upgrade due to failing issues

Author: pranav24gupta

gradle.properties

@@ -7,7 +7,7 @@ developerName = Andrey Hihlovskiy
 license = MIT
 group = org.gretty
 version = 4.1.3-SNAPSHOT
-jetty11_version = 11.0.20
+jetty11_version = 11.0.17
 jetty11_servlet_api_version = 5.0.0
 tomcat10_version = 10.1.19
 tomcat10_servlet_api_version = 5.0.0