Activate stale (#3898)

* Update stale.yml

Update pr text
Schedule action 3 times a day

* Delete old .github/stale.yml

* Set exempt-all-milestones to true in stale.yml

.github/workflows/stale.yml

@@ -1,7 +1,7 @@
 name: 'Close stale issues and PRs'
 on:
   schedule:
-    - cron: '0 12 * * *'
+    - cron: '0 6,12,18 * * *'
   workflow_dispatch:
 
 jobs:
@@ -14,6 +14,7 @@ jobs:
           days-before-close: 7
           exempt-issue-labels: 'pinned,keep,enhancement,confirmed'
           exempt-pr-labels: 'pinned,keep,enhancement,confirmed'
+          exempt-all-milestones: true
           stale-issue-message: >
             Hey! This issue has been open for quite some time without any new comments now.
             It will be closed automatically in a week if no further activity occurs.
@@ -23,5 +24,4 @@ jobs:
             Hey! This pull request has been open for quite some time without any new comments now.
             It will be closed automatically in a week if no further activity occurs.
             
-            Thank you for using WLED! ✨
-          debug-only: true
+            Thank you for contributing to WLED! ❤️