Update actions/checkout action to v6

.github/workflows/build-container.yaml

@@ -22,7 +22,7 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set build args
         run: |
           echo "PYTHON_VERSION=$(cat .python-version)" >> $GITHUB_ENV

.github/workflows/lint.yaml

@@ -13,7 +13,7 @@ jobs:
       matrix:
         python-version: ["3.13"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Task
         uses: arduino/setup-task@v2
         with:

.github/workflows/release.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v6

.github/workflows/tests.yaml

@@ -13,7 +13,7 @@ jobs:
       matrix:
         python-version: ["3.13"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Task
         uses: arduino/setup-task@v2
         with: