Adapt custom_plugin test to Kotlin 1.7.20

Author: smowton

java/ql/integration-tests/linux-only/kotlin/custom_plugin/plugin/Plugin.kt

@@ -4,7 +4,7 @@ import com.intellij.mock.MockProject
 import org.jetbrains.kotlin.backend.common.IrElementTransformerVoidWithContext
 import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
 import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
-import org.jetbrains.kotlin.backend.common.ir.createImplicitParameterDeclarationWithWrappedDescriptor
+import org.jetbrains.kotlin.backend.common.ir.addDispatchReceiver
 import org.jetbrains.kotlin.backend.common.lower.DeclarationIrBuilder
 import org.jetbrains.kotlin.compiler.plugin.ComponentRegistrar
 import org.jetbrains.kotlin.config.CompilerConfiguration
@@ -30,6 +30,7 @@ import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.defaultType
 import org.jetbrains.kotlin.ir.types.typeWith
+import org.jetbrains.kotlin.ir.util.createImplicitParameterDeclarationWithWrappedDescriptor
 import org.jetbrains.kotlin.ir.util.defaultType
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name