Update actions/checkout action to v4.3.0 (#137)

Co-authored-by: small-hack-renovate[bot] <151926327+small-hack-renovate[bot]@users.noreply.github.com>

Author: small-hack-renovate[bot]

.github/workflows/renovate.yml

@@ -24,7 +24,7 @@ jobs:
           app_id: ${{ secrets.APP_ID }}
 
       - name: Checkout
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@v4.3.0
 
       - name: Self-hosted Renovate
         # renovate keeps itself up to date