dependency: Update dependency com.sk89q.worldguard:worldguard-bukkit to v7.0.15 (#307)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

buildSrc/src/main/kotlin/Versions.kt

@@ -22,7 +22,7 @@ object Versions {
     const val CAFFEINE = "3.2.3"
 
     const val B_STATS_BUKKIT = "3.1.0"
-    const val WORLD_GUARD_BUKKIT = "7.0.14"
+    const val WORLD_GUARD_BUKKIT = "7.0.15"
 
     const val PLACEHOLDER_API = "2.11.7"
     const val LANDS_API = "7.17.2"