fix(deps): update jetty to v11.0.21 (#107)

Author: hartmut-co-uk

gradle/libs.versions.toml

@@ -15,7 +15,7 @@ guava = "33.2.0-jre"
 logback = "1.5.6"
 slf4j = "2.0.13"
 
-jetty = "11.0.20"
+jetty = "11.0.21"
 jersey_container_servlet = "3.1.7"
 jersey_hk2 = "3.1.7"
 jersey_media_json_jackson = "3.1.7"