[CI] Fix MacOS builds in Github Actions (#158)

Use newer versions of Macos and Xcode that are available in Github Actions.

.github/workflows/macos.yml

@@ -16,34 +16,22 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - xcode: 11
-            build_type: Debug
-            os: macos-11
-          - xcode: 11
+          - xcode: 14
             build_type: Release
-            os: macos-11
-          - xcode: 12
-            build_type: Debug
-            os: macos-11
-          - xcode: 12
+            os: macos-13
+          - xcode: 15
             build_type: Release
-            os: macos-11
-          - xcode: 13
-            build_type: Debug
-            os: macos-12
-          - xcode: 13
+            os: macos-14
+          - xcode: 16
             build_type: Release
-            os: macos-12
-          - xcode: 14
-            build_type: Debug
-            os: macos-12
-          - xcode: 14
-            build_type: Release
-            os: macos-12
+            os: macos-15
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v3
+    - name: Install Ninja
+      run: brew install ninja
+
+    - uses: actions/checkout@v4
       with:
         submodules: recursive
 
@@ -54,10 +42,10 @@ jobs:
     - run: cmake -E make_directory build
 
     - working-directory: build/
-      run: cmake $GITHUB_WORKSPACE
+      run: cmake $GITHUB_WORKSPACE -GNinja -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
 
     - working-directory: build/
-      run: cmake --build . --config ${{ matrix.build_type }}
+      run: cmake --build .
 
     - working-directory: build/
-      run: ctest --config ${{ matrix.build_type }} --output-on-failure
+      run: ctest --output-on-failure

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.10)
 
 project(taocpp-json VERSION 1.0.0 LANGUAGES CXX)