Bump actions/checkout from 2 to 4 (#28)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/check_doxygen_awesome_version.yml

@@ -12,7 +12,7 @@ jobs:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Open PR if doxygen-awesome outdated.
         run: |
 

.github/workflows/ci.yml

@@ -60,7 +60,7 @@ jobs:
               flags: '-DHIGHFIVE_TEST_BOOST=Off -DCMAKE_CXX_STANDARD=20 -DHIGHFIVE_HAS_CONCEPTS=On'
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -97,7 +97,7 @@ jobs:
         hdf5_version : [ hdf5-1_8_23, hdf5-1_10_11, hdf5-1_12_3, hdf5_1.14.6 ]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
     - name: "Install libraries"
@@ -158,7 +158,7 @@ jobs:
 
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -200,7 +200,7 @@ jobs:
         ]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -245,7 +245,7 @@ jobs:
       matrix:
         parallelism: [ serial, parallel ]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -277,7 +277,7 @@ jobs:
   Benchmarks:
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -307,7 +307,7 @@ jobs:
             cxxstd: "20"
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -351,7 +351,7 @@ jobs:
         cxxstd: ["14", "17", "20"]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 

.github/workflows/clang_format.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Run clang-format
       run: |

.github/workflows/coverage.yml

@@ -38,7 +38,7 @@ jobs:
         sudo apt-get install libhdf5-dev libsz2 libboost-all-dev libeigen3-dev libopencv-dev
         sudo apt-get install libxtensor-dev
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 1
         submodules: true

.github/workflows/version_file.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true