chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/publish.yml

@@ -36,7 +36,7 @@ jobs:
           private_key: ${{ secrets.CI_BOT_SECRET }}
 
       - name: Setup | Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.ref_name }}
           fetch-depth: 0

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Setup | Checkout Repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup | Install uv
         uses: astral-sh/setup-uv@v5