build: Update dependency com.plotsquared:PlotSquared-Core to v6.2.1 (#61)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@
 paper = "1.17.1-R0.1-SNAPSHOT"
 
 # Plugins
-plotsquared = "6.2.0"
+plotsquared = "6.2.1"
 worldedit = "7.2.8"
 dynmap = "3.2-beta-1"