Remove old atomicfu plugin reference

Author: DrewCarlson

gradle/libs.versions.toml

@@ -35,7 +35,6 @@ atomicfu = { id = "org.jetbrains.kotlinx.atomicfu", version.ref = "atomicfu" }
 coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "coroutines" }
 coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version.ref = "coroutines" }
 atomicfu = { module = "org.jetbrains.kotlinx:atomicfu", version.ref = "atomicfu" }
-atomicfu-plugin = { module = "org.jetbrains.kotlinx:atomicfu-gradle-plugin", version.ref = "atomicfu" }
 agp = { module = "com.android.tools.build:gradle", version.ref = "agp" }
 guava = { module = "com.google.guava:guava", version.ref = "guava" }
 awaitility = { module = "org.awaitility:awaitility", version.ref = "awaitility" }