deploy: update build and deploy timeout to 3600s

Flex deploys can take a very long time. Our build time itself is about
23 minutes, so let's give ourselves some more headroom.

Change-Id: I2fa65bf1df6ef97aa4044ce3cfeaa47a429e39bd
Reviewed-on: https://go-review.googlesource.com/c/playground/+/366180
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>

Author: toothrot

deploy/deploy.json

@@ -37,5 +37,5 @@
       ]
     }
   ],
-  "timeout": "1800s"
+  "timeout": "3600s"
 }

deploy/deploy_gotip.json

@@ -26,5 +26,5 @@
       ]
     }
   ],
-  "timeout": "1800s"
+  "timeout": "3600s"
 }