Upgrade to Jetty 9.4.51.v20230217

Closes gh-35479

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -903,7 +903,7 @@ bom {
 			]
 		}
 	}
-	library("Jetty", "9.4.46.v20220331") {
+	library("Jetty", "9.4.51.v20230217") {
 		prohibit("[11.0.0-alpha0,)") {
 			because "it uses the jakarta.* namespace"
 		}