MAINT: drop deprecated plot argument

[DerWeh]

use_line_collection is deprecated since 3.6 and was removed in 3.8, see https://matplotlib.org/3.7.3/api/_as_gen/matplotlib.pyplot.stem.html

[mathurinm]

Thanks @DerWeh , we still get

MatplotlibDeprecationWarning: The 'use_line_collection' parameter of stem() was deprecated in Matplotlib 3.6 and will be removed two minor releases later. If any parameter follows 'use_line_collection', they should be passed as keyword, not positionally.
  m, s, _ = plt.stem(np.where(w_true)[0], w_true[w_true != 0],

in https://output.circle-artifacts.com/output/job/2d69f75d-0a6a-44b5-ac41-9380cc2bddfc/artifacts/0/dev/auto_examples/plot_group_lasso.html#sphx-glr-auto-examples-plot-group-lasso-py (last line) can you fix this ?

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[DerWeh]

You are right, I overlooked the first plt.stem call. DeprecationWarnings trigger only once, and I forgot to restart the session (or display them always)...

[mathurinm]

Thanks @DerWeh!