dev: exempt milestones/assignees from stale bot

Mistook exempt-{milestones,assignees} for
exempt-all-{milestones,assignees}. If an issue/PR is assigned one, it
means it's been approved/accepted, and I'll get around to it.

.github/workflows/triage.yml

@@ -19,10 +19,10 @@ jobs:
             remove the label. It will otherwise be closed in 7 days.
           exempt-issue-labels: ':heart:,needs-triage,backlog,help wanted,1. announcement,2. status:confirmed'
           exempt-pr-labels:    ':heart:,needs-triage,backlog,2. status:confirmed,2. status:archived,2. status:resolved-temporarily,2. status:waiting,2. status:needs-work'
-          stale-issue-label:   stale
-          stale-pr-label:      stale
-          exempt-milestones:   true
-          exempt-assignees:    true
+          stale-issue-label: stale
+          stale-pr-label: stale
+          exempt-all-milestones: true
+          exempt-all-assignees: true
       - uses: dessant/lock-threads@v2
         with:
           github-token: ${{ github.token }}