GH-56 Update dependency me.clip:placeholderapi to v2.11.6 (#56)

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

Author: renovate[bot]

lobbyheads-core/build.gradle.kts

@@ -38,7 +38,7 @@ dependencies {
     implementation("com.github.unldenis:holoeasy:3.0.1")
 
     // PlaceholderAPI, if anyone wants to parse placeholders in the head's name
-    compileOnly("me.clip:placeholderapi:2.11.5")
+    compileOnly("me.clip:placeholderapi:2.11.6")
 
     // bstats
     implementation("org.bstats:bstats-bukkit:3.0.2")