Fix: Workflow for PyPI deploy missing toml package

[D-o-d-o-x]

Automatic publishing of the 0.3.0 release (#97) was unsuccessful as the version consistency check could not be performed due to missing the toml package. This PR will fix this issue. I also pushed the 0.3.0 release manually to PyPI (https://pypi.org/project/fancy-gym/0.3.0/).