c-cpp.yml: Install meson and ninja via brew not pip

Fix CI error "This environment is externally managed
╰─> To install Python packages system-wide, try brew install
    xyz, where xyz is the package you are trying to
    install."

.github/workflows/c-cpp.yml

@@ -96,9 +96,9 @@ jobs:
 
     - if: ${{ contains(matrix.build.os, 'macos') }}
       run: |
-        pip3 install meson ninja
-        brew update
         brew install \
+          meson \
+          ninja \
           ncurses \
           pkg-config \
           ${{ matrix.build.install_packages }}