[openstreetmap/openstreetmap-website] Update leaflet to 1.6.0 (#2574)

[Simon Legner]

Here's the announcement from 2019-11-17: https://leafletjs.com/2019/11/17/leaflet-1.6.0.html

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/2574#issuecomment-606940900
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