[Fix] Incorporate poetry changes into nightly build workflows

[jhamon]

Problem

Nightly builds have not succeeded since poetry stuff got merged a couple of weeks ago. This is because the version update step was not updated to change the version number in pyproject.toml and pypi complained of version conflicts.

Solution

Use poetry to set version in pyproject.toml before uploading to pypi.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• Infrastructure change (CI configs, etc)

[austin-denoble]

Thanks again for getting this cleaned up.