chore: upgrade copilot to 24.8.0.alpha8 (#7656)

Author: ZheSun88

versions.json

@@ -409,7 +409,7 @@
             "javaVersion": "1.2.3"
         },
         "copilot": {
-            "javaVersion": "24.8.0.alpha7"
+            "javaVersion": "24.8.0.alpha8"
         },
         "kubernetes-kit-starter": {
             "javaVersion": "2.4.2"