Bump actions/checkout from 4 to 6 (#205)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Thibault Poignonec <[email protected]>

Author: dependabot[bot]

.github/workflows/ci-format.yml

@@ -12,7 +12,7 @@ jobs:
     name: Format
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/[email protected]
       with:
         python-version: '3.10'

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Prepare
         run: |
           mkdir -p ${{github.workspace}}/src
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           path: src/ethercat_driver_ros2
 

.github/workflows/documentation.yml

@@ -19,7 +19,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install dependencies
         run: |