Update c++_cmake.yml

* Use GCC 13 (gcc-13 and g++-13) in GitHub Actions.

.github/workflows/c++_cmake.yml

@@ -24,7 +24,7 @@ jobs:
     - name: Configure CMake
       # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
       # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
-      run: cmake -S ${{github.workspace}}/C++ -B ${{github.workspace}}/C++/build -D CMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -D CMAKE_C_COMPILER=gcc-14 -D CMAKE_CXX_COMPILER=g++-14
+      run: cmake -S ${{github.workspace}}/C++ -B ${{github.workspace}}/C++/build -D CMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -D CMAKE_C_COMPILER=gcc-13 -D CMAKE_CXX_COMPILER=g++-13
 
     - name: Build
       # Build your program with the given configuration