Deprecate conjtransp method from dok_matrix and dok_array

I'd like to propose that we deprecate `conjtransp` from the sparse dok_matrix and dok_array classes.

The functionality is available via `.T.conj()`.
None of the other sparse formats have a `conjtransp` method.
I don't find it used elsewhere in the library and only one search hit github wide for `language:python ".conjtransp("`

I'm preparing a PR to deprecate this so am looking for comments/approval/etc from the mailing list.
Best,
Dan
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