build(deps): bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -85,7 +85,7 @@ jobs:
           echo "apps_ref=$APPS_REF" >> $GITHUB_OUTPUT
 
       - name: Checkout nuttx repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: apache/nuttx
           ref: ${{ steps.gittargets.outputs.os_ref }}
@@ -95,7 +95,7 @@ jobs:
         run: git -C sources/nuttx fetch --tags
 
       - name: Checkout apps repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: apache/nuttx-apps
           ref: ${{ steps.gittargets.outputs.apps_ref }}
@@ -319,7 +319,7 @@ jobs:
       run:
         shell: msys2 {0}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: msys2/setup-msys2@v2
         with:
           msystem: MSYS
@@ -393,7 +393,7 @@ jobs:
     if: ${{ needs.msvc-Arch.outputs.skip_all_builds != '1' }}
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       # Set up Python environment and install kconfiglib
       - name: Set up Python and install kconfiglib
         uses: actions/setup-python@v6

.github/workflows/check.yml

@@ -28,14 +28,14 @@ jobs:
 
     steps:
       - name: Checkout nuttx repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: apache/nuttx
           path: nuttx
           fetch-depth: 0
 
       - name: Checkout apps repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: apache/nuttx-apps
           path: apps

.github/workflows/labeler.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Assign labels based on paths
         uses: actions/labeler@main

.github/workflows/lint.yml

@@ -17,7 +17,7 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - run: mkdir super-linter.report