Upgrade actions/checkout to v6

Upgrades the package

Author: mehmetozguldev

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
     name: Bun — typecheck, frontend check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Vite+
         uses: voidzero-dev/setup-vp@v1.18.0