Remove weekly build schedule from lib.yml

Author: xmllint

.github/workflows/lib.yml

@@ -5,9 +5,6 @@ on:
  pull_request:
  types: [opened, reopened, synchronize, labeled]
 
- # Schedule weekly builds on every Sunday at 4 am
- schedule:
- - cron: "0 4 * * SUN"
 
 concurrency:
  group: libs-${{ github.event.pull_request.number || github.ref }}