Upgrade to Jetty 12.0.31

Closes gh-48452

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

@@ -1004,7 +1004,7 @@ bom {
 			]
 		}
 	}
-	library("Jetty", "12.0.30") {
+	library("Jetty", "12.0.31") {
 		group("org.eclipse.jetty.ee10") {
 			bom("jetty-ee10-bom")
 		}