Update build_and_test.yml

.github/workflows/build_and_test.yml

@@ -144,11 +144,11 @@ jobs:
     - name: Build
       # Build your program with the given configuration. Note that --config is needed because the default Windows generator is a multi-config generator (Visual Studio generator). Use multiple cpu cores available in the runner.
       shell: bash -l {0}
-      run: cmake --build "${{ github.workspace }}/build" --config "${{ matrix.build_type }}" -j4
+      run: cmake --build "${{ github.workspace }}/build" --config "${{ matrix.build_type }}" -j3
 
 
     - name: Test
       working-directory: "${{ github.workspace }}/build"
       # Execute tests defined by the CMake configuration. Note that --build-config is needed because the default Windows generator is a multi-config generator (Visual Studio generator).
       # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
-      run: ctest --build-config ${{ matrix.build_type }} --output-on-failure -j4
+      run: ctest --build-config ${{ matrix.build_type }} --output-on-failure -j4