Longer lexbox-deployment time for local-dev

The lexbox deployment is always the last one to finish, and if anything
has gone slightly wrong with other deployments (such as low RAM causing
other deployments to happen one at a time instead of all at once), it's
easy for it to go past the 80-second timeout we set, and for `task up`
to fail. So on local-dev, we want a 5-minute timeout for the lexbox
deployment, which should be plenty long enough for everything to settle.

deployment/local-dev/lexbox-deployment.patch.yaml

@@ -7,6 +7,7 @@ metadata:
   labels:
     app: lexbox
 spec:
+  progressDeadlineSeconds: 300
   template:
     spec:
       containers: