Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v3...v4)

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

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

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install clang-tidy
       run: |
         sudo apt-get install -y clang-tidy-11
@@ -46,7 +46,7 @@ jobs:
        CXX: ${{ matrix.compiler.cpp }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install valgrind
       run: |
          sudo apt install -y valgrind
@@ -76,7 +76,7 @@ jobs:
        CXX: ${{ matrix.compiler.cpp }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Build and test
       env:
          CMAKE_OPTIONS: -DCMARK_SHARED=OFF
@@ -97,7 +97,7 @@ jobs:
        CMAKE_OPTIONS: ${{ matrix.cmake_opts }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ilammy/msvc-dev-cmd@v1
     - name: Build and test
       run: |