Now use comma-separated list for exempt-issue-labels

.github/workflows/stale.yml
- The exempt-issue-labels YAML tag should have had a comma-separated list
  of labels not to be marked stale.  We had used a YAML sequence, which
  caused the GitHub "Mark stale issues" to fail.  Now fixed.

CHANGELOG.md
- Updated accordingly

Signed-off-by: Bob Yantosca <[email protected]>

.github/workflows/stale.yml

@@ -22,14 +22,7 @@ jobs:
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         stale-issue-label: 'stale'
-        exempt-issue-labels:
-          - 'category: Discussion'
-          - 'category: Feature Request'
-          - 'deferred'
-          - 'help needed: Open Research Problem'
-          - 'help needed: Request Input from Community'
-          - 'never stale'
-          - 'TODO: Documentation'
+        exempt-issue-labels: 'category: Discussion','category: Feature Request','deferred','help needed: Open Research Problem','help needed: Request Input from Community','never stale','TODO: Documentation'
         days-before-issue-stale: 30
         days-before-issue-close: 7
         stale-issue-message: 'This issue has been automatically marked as stale because it has not had recent activity. If there are no updates within 7 days it will be closed. You can add the "never stale" tag to prevent the issue from closing this issue.'

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased] - TBD
+### Fixed
+- Fixed formatting error in `.github/workflows/stale.yml` that caused the Mark Stale Issues action not to run
+
 ## [3.9.0] - 2024-05-30
 ### Added
 - GitHub Action config file `.github/workflows/stale.yml`, which replaces StaleBot