CodeQL Fix

Author: jeffgbutler

src/test/kotlin/nullability/test/CompilerUtilities.kt

@@ -15,19 +15,19 @@
  */
 package nullability.test
 
+import java.nio.file.Files
 import org.jetbrains.kotlin.cli.common.arguments.K2JVMCompilerArguments
 import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSeverity
 import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSourceLocation
 import org.jetbrains.kotlin.cli.common.messages.MessageCollector
 import org.jetbrains.kotlin.cli.jvm.K2JVMCompiler
 import org.jetbrains.kotlin.config.Services
-import java.io.File
 
 /**
  * Compiles the source lines and returns any error reports generated by the compiler.
  */
 fun compile(source: String): CompilerErrorMessageCollector {
-    val file: File = File.createTempFile("KotlinTest", ".kt")
+    val file = Files.createTempFile("KotlinTest", ".kt").toFile()
     file.deleteOnExit()
     // normalize line endings and write to temp file
     file.writeText(source.trimIndent().lines().joinToString(separator = System.lineSeparator()))