Bump actions/checkout from 4 to 6

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] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -22,7 +22,7 @@ jobs:
             compiler: gcc-12
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Check OS name
         run: echo "The operating system on the runner is $RUNNER_OS."
       - name: Install dependencies

.github/workflows/codeql-analysis.yml

@@ -22,7 +22,7 @@ jobs:
         language: [ 'cpp' ]
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Install application build dependencies
       run: sudo apt-get install libbz2-dev zlib1g-dev
     - name: Initialize CodeQL