Don't schedule this workflow

If a workflow is scheduled and the repo is idle for too long, then
GitHub disables the entire workflow, including the non-scheduled parts
of it.

I don't really need this to be a scheduled workflow, so let's simply
Not.

Author: lukegb

.github/workflows/ci.yml

@@ -1,7 +1,5 @@
 name: ci
 on:
-  schedule:
-    - cron: "0 0 * * *"
   push:
     branches:
       - canon