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](actions/checkout@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/macos.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: macos-11
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
       - uses: maxim-lobanov/setup-xcode@v1
@@ -38,7 +38,7 @@ jobs:
     runs-on: macos-12
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
       - uses: maxim-lobanov/setup-xcode@v1

.github/workflows/ubuntu.yml

@@ -21,7 +21,7 @@ jobs:
       CXX: ${{ matrix.compiler }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: cmake
       run: cmake -S . -B build -DCMAKE_CXX_STANDARD=20 -DCMAKE_CXX_STANDARD_REQUIRED=ON -DJSONCONS_BUILD_TESTS=On
 
@@ -169,7 +169,7 @@ jobs:
         compiler: ['6','7','8','9','10','11','12','latest']
     container: gcc:${{ matrix.compiler }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Get latest CMake and ninja
         uses: lukka/get-cmake@v3.27.7
       - name: cmake
@@ -188,7 +188,7 @@ jobs:
         compiler: ['12','latest']
     container: gcc:${{ matrix.compiler }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Get latest CMake and ninja
         uses: lukka/get-cmake@v3.27.7
       - name: cmake
@@ -210,7 +210,7 @@ jobs:
     steps:
       - name: Install unzip and git
         run: apt-get update ; apt-get install -y unzip git
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Get latest CMake and ninja
         uses: lukka/get-cmake@v3.27.7
       - name: cmake
@@ -231,7 +231,7 @@ jobs:
     steps:
       - name: Install unzip and git
         run: apt-get update ; apt-get install -y unzip git
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Get latest CMake and ninja
         uses: lukka/get-cmake@v3.27.7
       - name: cmake