Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout 🛎️
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v6.0.0
       - name: Pnpm 🧱
         uses: pnpm/[email protected]
       - name: Node.js 🧰