allow manually running stale workflow (#3580)

Author: khassel

.github/workflows/stale.yaml

@@ -1,6 +1,7 @@
 name: "Close stale issues and PRs"
 
 on:
+  workflow_dispatch: # needed for manually running this workflow
   schedule:
     - cron: "30 1 * * 6" # every Saturday at 1:30
 

CHANGELOG.md

@@ -17,7 +17,7 @@ _This release is scheduled to be released on 2025-01-01._
 
 ### Updated
 
-- [repo] reactivated `stale.yaml` as github action to mark issues as stale after 60 days and close them 7 days later (if no activity)
+- [repo] reactivated `stale.yaml` as github action to mark issues as stale after 60 days and close them 7 days later (if no activity).
 
 ### Fixed