Installation issue: py-shapely@1.8.x with python@3.10.y

[climbfuji]

Steps to reproduce the issue

Install py-shapely@1.8.x with python@3.10.y on a system that does not have a cython installation somewhere in an external Python installation.

The build step for py-shapely fails, because it cannot find the cython executable. This is because py-cython(@0.29.24) gets installed in subdirectory local of the installation prefix when using python@3.10.

Error message

Don't have the log anymore, but the error message when installing is that it cannot find cython.

Information on your system

* **Spack:** 0.19.0.dev0 (3e6059c68a897028c447bee5b5be164b5fa3282d)
* **Python:** 3.10.6
* **Platform:** linux-ubuntu22.04-haswell
* **Concretizer:** clingo

Additional information

No response

General information

• I have run spack debug report and reported the version of Spack/Python/Platform
• I have run spack maintainers <name-of-the-package> and @mentioned any maintainers
• I have uploaded the build log and environment files
• I have searched the issues of this repo and believe this is not a duplicate