Merge pull request matplotlib#30921 from timhoffm/ci-stale-exclude

Exclude confirmed bugs from stale bot

Author: QuLogic

.github/workflows/stale-tidy.yml

@@ -20,5 +20,5 @@ jobs:
           close-issue-label: "status: closed as inactive"
           days-before-issue-close: 30
           ascending: true
-          exempt-issue-labels: "keep"
+          exempt-issue-labels: "keep,status: confirmed bug"
           exempt-pr-labels: "keep,status: orphaned PR"