disable cron job

clippy regularly finds ways to improve the code, and that's a nuisance
while it's unclear where the project will go.

.github/workflows/ci.yml

@@ -4,7 +4,7 @@ on:
   push:
   pull_request:
   workflow_dispatch:
-  schedule: [cron: "40 1 * * *"]
+  # schedule: [cron: "40 1 * * *"]
 
 permissions:
   contents: read