Remove version constraints for Cython

Author: oscarbenjamin

bin/cibw.sh

@@ -23,7 +23,7 @@ export CIBW_BEFORE_ALL_LINUX=bin/cibw_before_all_linux.sh
 export CIBW_BEFORE_ALL_MACOS=bin/cibw_before_all_macosx_arm64.sh
 export CIBW_BEFORE_ALL_WINDOWS='C:\\msys64\\usr\\bin\\bash bin/cibw_before_all_windows.sh'
 
-export CIBW_BEFORE_BUILD='pip install numpy '"'"'cython>=3'"'"' delvewheel'
+export CIBW_BEFORE_BUILD='pip install numpy cython delvewheel'
 export CIBW_BEFORE_BUILD_WINDOWS='C:\\msys64\\usr\\bin\\bash bin/cibw_before_build_windows.sh'
 
 export CIBW_REPAIR_WHEEL_COMMAND_WINDOWS='bin\cibw_repair_wheel_command_windows.bat {dest_dir} {wheel}'

bin/cibw_before_build_windows.sh

@@ -40,4 +40,4 @@ mv libpython${VER}.a libs
 #  Install build dependencies                     #
 ###################################################
 
-pip install 'cython>=3' numpy delvewheel
+pip install cython numpy delvewheel