* py-flatten-dict: require poetry to build.
The sources seem to contain a bundled, auto-generated `setup.py`.
Building with `pip` insist on using Poetry as mentioned in
`pyproject.toml`, so require it as a build dependency.
* Update var/spack/repos/builtin/packages/py-flatten-dict/package.py
Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>
* Update var/spack/repos/builtin/packages/py-flatten-dict/package.py
Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>
Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>
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