nipanel project has no trove classifiers

[bkeryan]

Bug Report

Projects on PyPI use "trove classifiers" to display common attributes:

nipanel's pyproject.toml is missing the classifiers key.

Repro or Code Sample

N/A

Expected Behavior

Project has classifiers.

Current Behavior

Project doesn't have classifiers.

Possible Solution

Add classifiers key to pyproject.toml

Context

N/A

Your Environment

N/A

AB#3243650