Update actions/stale digest to 99b6c70 (#2848)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/close_stale.yml

@@ -12,7 +12,7 @@ jobs:
       pull-requests: write  # for actions/stale to close stale PRs
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/stale@9c1b1c6e115ca2af09755448e0dbba24e5061cc8 # tag=v5
+    - uses: actions/stale@99b6c709598e2b0d0841cd037aaf1ba07a4410bd # tag=v5
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         stale-issue-message: 'This issue is stale because it has been open 180 days with no activity. Remove the "stale" label or comment or this will be closed in 14 days.'