ci: Fix v4.0.0 breaking changes

See: https://github.com/actions/stale/releases/tag/v4.0.0

Author: mydea

.github/workflows/stale.yml

@@ -28,7 +28,6 @@ jobs:
             ----
 
             "A weed is but an unloved flower." ― _Ella Wheeler Wilcox_ 🥀
-          skip-stale-issue-message: false
           close-issue-label: ''
           close-issue-message: ''
 
@@ -42,6 +41,5 @@ jobs:
             ----
 
             "A weed is but an unloved flower." ― _Ella Wheeler Wilcox_ 🥀
-          skip-stale-pr-message: false
           close-pr-label:
           close-pr-message: ''