[github-actions] Fix cython installation for macOS build
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 584f2e9..76cd02a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -74,7 +74,7 @@
           else
             brew install libtool autoconf automake pkgconfig
           fi
-          pip3 install cython
+          pip3 install --break-system-packages cython
       shell: bash
     - name: fetch libplist
       uses: dawidd6/action-download-artifact@v3