Remove unused plugin from version catalog

Author: OptimumCode

gradle/libs.versions.toml

@@ -10,7 +10,6 @@ openapi = "2025.1"
 jackson = "2.18.2"
 
 [plugins]
-kotlin-mutliplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
 kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
 kotlin-benchmark = { id = "org.jetbrains.kotlinx.benchmark", version.ref = "benchmark" }
 kotlin-allopen = { id = "org.jetbrains.kotlin.plugin.allopen", version.ref = "kotlin" }