Update plotsquared to v6.11.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.plotsquared:PlotSquared-Bukkit (source)	6.11.1 → 6.11.2
com.plotsquared:PlotSquared-Core (source)	6.11.1 → 6.11.2

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