CI: cache-deps: rm pull request hook

I needed to remove
b0621d7
before merge.

That is my fault, I should be more conservative between draft<->mergable PR.

Author: Anton-Latukha

.github/workflows/cache-deps.yml

@@ -18,9 +18,6 @@ on:
   schedule:
     # Try to save snapshot every day at 03:45 UTC (~21:45 in California)
     - cron: "45 3 * * *"
-  pull_request:
-    branches:
-      - '**'
 
 jobs:
   pre_job: