Update .github/workflows/close-stale-issues.yml: set ignore-pr-updates to true

Without this option, stale counters for each PR keep restarting whenever any update occurs or a comment is added to them. Since the counters for PR are set to 365 days, ignore-pr-updates should help us to get rid of zombie PRs (which are kept open by bumps).

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

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

@@ -46,4 +46,4 @@ jobs:
           # An allow-list of label(s) to only process the PRs which contain one of these label(s).
           any-of-pr-labels: 'needs-rebase'
           # Use this to ignore updates such as comments (only to keep the PR alive by bumping)
-          # ignore-pr-updates: true
+          ignore-pr-updates: true