Properly refer to outputs in steps when setting job output (#4269)

Author: dadepo

.github/workflows/publish-stable.yml

@@ -44,7 +44,7 @@ jobs:
           echo ::set-output name=tag_commit::$TAG_COMMIT
 
     outputs:
-      is_stable: ${{ steps.release_type.stable_commit == steps.release_type.tag_commit }}
+      is_stable: ${{ steps.release_type.outputs.stable_commit == steps.release_type.outputs.tag_commit }}
       tag: ${{ steps.get_tag.outputs.tag }}
       prev_tag: ${{ steps.get_prev_tag.outputs.prev_tag }}