build: ensure x86_64-apple-darwin toolchain

Author: jstewmon

Diff for: .github/workflows/ci.yml

@@ -239,8 +239,9 @@ jobs:
           CIBW_ARCHS_WINDOWS: AMD64
           CIBW_BEFORE_ALL_LINUX: >
             curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain stable -y
-          CIBW_BEFORE_ALL_MACOS: >
+          CIBW_BEFORE_ALL_MACOS: |
             rustup target add aarch64-apple-darwin
+            rustup target add x86_64-apple-darwin
           CIBW_ENVIRONMENT_LINUX: PATH=/root/.cargo/bin:$PATH
           CIBW_BUILD: ${{ matrix.py }}-${{ matrix.platform.name }}_*
           CIBW_TEST_COMMAND: python {project}/tests/test_py.py