Remove Stamen basemaps

[leehart]

Re: issue #443

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Codecov Report

Merging #445 (63a837b) into master (c637e39) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #445   +/-   ##
=======================================
  Coverage   97.50%   97.50%           
=======================================
  Files          26       26           
  Lines        2086     2086           
=======================================
  Hits         2034     2034           
  Misses         52       52           

Files	Coverage Δ
malariagen_data/anoph/map_params.py	100.00% <ø> (ø)

[ahernank]

There might be other "terrain" sources if we wanted to regain this one in the future (e.g. https://github.com/geopandas/xyzservices/blob/5e9798aba5deafade06d11be573f5b1c1e993415/provider_sources/leaflet-providers-parsed.json#L674) but looking through all of those and deciding which one is the closest to the Stamen one seems well-outside of this fix..

[leehart]

Thanks @ahernank . Yes, there might be some other notebooks somewhere using these particular base maps tile sets, which will turn yucky due to Stamen withdrawing their free service, which is also affecting other middleware, e.g.: https://ipyleaflet.readthedocs.io/en/latest/map_and_basemaps/basemaps.html

...but the urgent problem is that it's preventing this package from being imported. We should probably look at avoiding this vulnerability, e.g. in case Esri also decide to withdraw their free service. I will merge and make a patch release shortly to re-enable package import.