Update staging.yml

Author: ammbra

staging.yml

@@ -28,7 +28,7 @@ asciidoc:
     kn-client-version: v1.1.0
     camel-source-version: v0.24.0
     kafka-source-version: v1.1.0
-    kamel-version: 1.3.1
+    kamel-version: 1.8.0
     kubernetes-cli: kubectl
     release-version: master
     page-pagination: true