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] <[email protected]>

Author: dependabot[bot]

.github/workflows/build_cmake.yml

@@ -108,7 +108,7 @@ jobs:
           }
     steps:
     - name: Checkout doxygen
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
 

.github/workflows/coverity.yml

@@ -19,7 +19,7 @@ jobs:
     outputs:
       should_run: ${{ steps.should_run.outputs.should_run }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: print latest_commit
         run: echo ${{ github.sha }}
 
@@ -40,7 +40,7 @@ jobs:
 
     steps:
       - name: Checkout doxygen
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Download Coverity
         run: |

.github/workflows/docker_publish.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Log in to the Container registry
         uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef

.github/workflows/doxmlparser-publish.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python
       uses: actions/setup-python@v6
       with: