Oops add ninja to mac as well

Author: matthew-brett

.github/workflows/wheels-macos.yml

@@ -39,7 +39,7 @@ jobs:
       PLAT: ${{ matrix.platform }}
       MB_PYTHON_VERSION: ${{ matrix.python }}
       TRAVIS_OS_NAME: "osx"
-      BUILD_BASE: "meson-python>=0.13 cython>=3"
+      BUILD_BASE: "meson-python>=0.13 ninja cython>=3"
     steps:
       - uses: actions/checkout@v4
         with: