Fix "Should be replaced with Kotlin function" warnings

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt

@@ -306,7 +306,7 @@ abstract class BaseGradleIT {
         } catch (t: Throwable) {
             // to prevent duplication of output
             if (!options.forceOutputToStdout) {
-                System.out.println(result.output)
+                println(result.output)
             }
             throw t
         }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/util/gradleRunningUtils.kt

@@ -37,7 +37,7 @@ fun runProcess(
     val sb = StringBuilder()
     process.inputStream!!.bufferedReader().forEachLine {
         if (options?.forceOutputToStdout ?: false) {
-            System.out.println(it)
+            println(it)
         }
         sb.appendln(it)
     }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/multiprojectWithDependency/projB/src/main/kotlin/helloWorld.kt

@@ -1,7 +1,7 @@
 package projB
 
 fun main(vararg args: String) {
-    System.out.println(projA.getInfo())
+    println(projA.getInfo())
 }