Update dependency leaflet to v1.4.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
leaflet	dependencies	minor	1.3.4 -> 1.4.0	source

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Release Notes

Leaflet/Leaflet

v1.4.0

Compare Source

API changes

• Add new Map.panInside method (#​6054 by daverayment)

Improvements

• Remove unused _drawnLayers object (#​6324 by ud09)
• Avoid unnecessary redrawing in TileLayer.setUrl() when URL does not change (#​6313 by JackNeus)
• Use section instead of form in layers control (#​6380 by hundekoerper)
• Add IE11 linked SVG elements support to DomUtil.getClass function (#​6366 by Schleuse)

Bug fixes

• Set internal flags at beginning of map initialization (#​6362 by ghybs)
• Guard against layers no longer attached to a map in bringToFront/Back() (#​6389 by perliedman)
• Fix autoPan option when popup content gets updated while a panning animation is running (#​6365 by Schleuse)
• Ignore dash arrays with non-numeric entries in canvas (#​6387 by perliedman)

Docs & Web Site

• Remove additional <tr> (#​6334 by mgred)
• Fix command to run test with karma options (#​6363 by ghybs)
• Add OSM logo to "Trusted by the best" section (#​6360 by astv99)
• Fix typos (#​6398 by HarryMaher)
• Make it clear zoomanim is not always fired on every frame (#​6388 by perliedman)
• Add copyright references to code examples (#​6439 by jbelien)
• Fix insecure content error (#​6442 by tambry)
• Remove incorrect Earth GIF (#​6326 by Vincentdecursay)
• Fix duplicated sentence in SVG section (#​6448 by patrickdemers6)

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