Bump actions/checkout from 6 to 7 (#1293)

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/cpp-ci-serial-programs-base.yml

@@ -47,7 +47,7 @@ jobs:
         echo "UPLOAD_FOLDER=$UPLOAD_FOLDER" >> $GITHUB_ENV
 
     - name: Checkout Arduino-Source
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
       with:
         path: 'Arduino-Source'
         submodules: 'recursive'
@@ -102,7 +102,7 @@ jobs:
         path: ${{env.UPLOAD_FOLDER}}
 
     - name: Checkout CommandLineTests
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
       if: inputs.run-tests
       with:
         repository: 'PokemonAutomation/CommandLineTests'

.github/workflows/tabs.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Fail if tabs are found in source files
         # Exclude specific file types if necessary (e.g., binaries, .md files, etc.)