default to merge method squash for agent-sandbox

Author: sdowell

config/prow/config.yaml

@@ -825,6 +825,7 @@ tide:
   merge_method:
     kubernetes-client/csharp: squash
     kubernetes-client/gen: squash
+    kubernetes-sigs/agent-sandbox: squash
     kubernetes-sigs/cluster-api-provider-digitalocean: squash
     kubernetes-sigs/cluster-api-provider-ibmcloud: squash
     kubernetes-sigs/external-dns: squash