update copilot to 24.9.0-beta2 (#7993)

Author: vaadin-bot

versions.json

@@ -409,7 +409,7 @@
             "javaVersion": "1.4.0-beta1"
         },
         "copilot": {
-            "javaVersion": "24.9.0-beta1"
+            "javaVersion": "24.9.0-beta2"
         },
         "kubernetes-kit-starter": {
             "javaVersion": "2.5.0-beta1"