Update stale.yml to 300 ops per run (#8061)

.github/workflows/stale.yml

@@ -35,4 +35,4 @@ jobs:
           days-before-stale: 30
           days-before-close: 5
           exempt-issue-labels: 'documentation,tutorial,TODO'
-          operations-per-run: 100  # The maximum number of operations per run, used to control rate limiting.
+          operations-per-run: 300  # The maximum number of operations per run, used to control rate limiting.