[FEA] Switch Conda from `matplotlib` to `matplotlib-base`

[jakirkham]

Currently matplotlib is used in cuOpt's Conda requirements

cuopt/dependencies.yaml

Line 743 in a35dffc

- matplotlib

However this pulls in GUI dependencies that are likely unneeded. To lighten the dependencies, would recommend using matplotlib-base with Conda instead

This can be done by adjusting matplotlib handling across dependency outputs

[chris-maes]

@rgsl888prabhu is this something we could do?

[rgsl888prabhu]

Yes, will put up a PR.