ci: fix archs for macOS

Author: janden

python/finufft/pyproject.toml

@@ -64,7 +64,7 @@ archs = "x86_64"
 before-all = "yum install -y fftw3-devel"
 
 [tool.cibuildwheel.macos]
-archs = "arm64"
+archs = ["x86_64", "arm64"]
 
 [tool.cibuildwheel.windows]
 archs = "AMD64"