Update actions/checkout action to v6 (#8695)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/merge_queue.yml

@@ -17,7 +17,7 @@ jobs:
           - check
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: 3.x
@@ -40,7 +40,7 @@ jobs:
   version:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Get release version string
         run: |
           echo "long=$(./bin/buildinfo.py long)" >> $GITHUB_OUTPUT
@@ -62,7 +62,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ github.event_name != 'workflow_dispatch' }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Build base
         id: base
         uses: ./.github/actions/setup-base
@@ -142,7 +142,7 @@ jobs:
     needs: [version, build]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{github.event.pull_request.head.ref}}
           repository: ${{github.event.pull_request.head.repo.full_name}}
@@ -221,7 +221,7 @@ jobs:
       - package-pio-deps-native-tft
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v6
@@ -290,7 +290,7 @@ jobs:
     needs: [release-artifacts, version]
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v6
@@ -345,7 +345,7 @@ jobs:
         esp32,esp32s3,esp32c3,esp32c6,nrf52840,rp2040,rp2350,stm32
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Python
         uses: actions/setup-python@v6