MAINT: anaconda=2024.02 and upgrade GA versions

[mmcky]

This PR

• update anaconda=2024.02
• updates Github Action version numbers

[mmcky]

• confirm execution with a full build

[mmcky]

• requires Use np.interp instead of interpolation.interp #156

[mmcky]

@kp992 it looks like matplotlib has changed the prop_cycler in anaconda=2024.02

There is an issue with

ts_ex1 = TaxSmoothingExample(g_ex1, P_ex1, b0_ex1, states_ex1, random_state=1)
ts_ex1.display()

with the following Attribute Error

AttributeError�'_process_plot_var_args' object has no attribute 'prop_cycler'

I suspect the issue is with the use of this hidden method in the function

        ax_ = ax.twinx()
        ax_._get_lines.prop_cycler = ax._get_lines.prop_cycler

[mmcky]

• re-enable build cache

Thanks @kp992