Incompatible dependencies in `pyproject.toml`

[stanmart]

Problem description

I believe some of the dependencies described in pyproject.toml are problematic. In particular, this set of deps seem incompatible with each other. ipykernel = "^4.8.2" resolves to `ipykernel = ">=4.8.2,<4.9", meaning that we are requesting a super old version. It is also indicative that conda cannot resolve them for this reason.

Expected Output

Some of the upper pins on jupyter-related packages should be relaxed.