Set day-before-close to -1

Set the `day-before-close` input to -1 to avoid closing issues.

Author: froi

.github/workflows/stale.yml

@@ -18,3 +18,4 @@ jobs:
         stale-issue-label: 'no-issue-activity'
         stale-pr-label: 'no-pr-activity'
         days-before-stale: 30
+        days-before-close: -1