Update dependency net.skinsrestorer:skinsrestorer-api to v15.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
net.skinsrestorer:skinsrestorer-api (source)	15.5.3 -> 15.6.0

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Release Notes

SkinsRestorer/SkinsRestorer (net.skinsrestorer:skinsrestorer-api)

v15.6.0: SkinsRestorer 15.6.0 (/skull command)

Compare Source

TL;DR:

• Added /skull command for server admins
• Allowing to change help message on /skin help
• Expose empty skinproperty in API
• Add small internal API for mysql updates
• Updated translations
• Fixed proxy plugin message bug

Changes

dec2ffc This commit marks release 15.6.0
617aa1b Add internal update api for mysql
bdd6747 Apply customHelp to help [query]
539c87b New translations locale.json (Turkish) (#​1902)
b926425 New translations locale.json (Hungarian) (#​1900)
fe2bd75 Make empty skin part of API
ebc37f6 Feature: /skull command (#​1741)
544377f Update all non-major dependencies (#​1898)
f951fba Prevent plugin message disconnected issues
1812cc3 Update all non-major dependencies (#​1896)

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