Update stale.yml

Author: Pil0tXia

Diff for: .github/workflows/stale.yml

@@ -47,4 +47,4 @@ jobs:
           exempt-issue-labels: 'pinned,discussion,help wanted,WIP,weopen-star,GLCC,summer of code'
           exempt-pr-labels: 'help wanted,dependencies'
           exempt-all-milestones: true # Exempt all issues/PRs with milestones from stale
-          operations-per-run: 30
+          operations-per-run: 300