add triaged label (open-telemetry#423)

Author: alrex

.github/workflows/close-stale-issues.yml

@@ -12,7 +12,7 @@ jobs:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         stale-issue-message: 'This issue was marked stale due to lack of activity. It will be closed in 30 days.'
         close-issue-message: 'Closed as inactive. Feel free to reopen if this issue needs resolving.'
-        exempt-issue-labels: 'feature-request'
+        exempt-issue-labels: 'feature-request,triaged'
         stale-issue-label: 'backlog'
         days-before-stale: 30
         days-before-close: 60