Update dependency leaflet.markercluster to v1.5.3 - autoclosed

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
leaflet.markercluster	1.5.1 -> 1.5.3

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Release Notes

Leaflet/Leaflet.markercluster

v1.5.3

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Bugfixes

• Removing unnecessary files on npm package
• Inlucding correct versioning on Github repo

v1.5.2

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Improvements

• Merged MR 1022 for Spiderfy on every room by MasterEric

Bugfixes

• Fixed issue 907 and 967 with MR 1027 from DerGuteWolf
• Removed unexpected dependencies in previous npm package

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Configuration

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