github: run (tenateively) every 10 minutes

The workflow takes longer than 5 minutes, github is already scheduling
us way less often than that, no sense trying to push for 5, let's go
down to 10 minutes and see if we can get more consistent runs.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>

Author: fabiobaltieri

.github/workflows/update.yaml

@@ -2,7 +2,7 @@ name: Update and publish
 
 on:
   schedule:
-    - cron: '*/5 * * * *'
+    - cron: '*/10 * * * *'
   push:
     branches:
       - main