Update GitHub Actions workflow to use actions/checkout@v4 for improved functionality

Author: jaydrogers

.github/workflows/scheduled-task_update-sponsors.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout 🛎️
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Generate Sponsors 💖
         uses: JamesIves/github-sponsors-readme-action@v1