bump memory for Apple targets test

Author: aSemy

modules/bcv-gradle-plugin-functional-tests/src/functionalTest/kotlin/kotlinx/validation/test/KlibVerificationTests.kt

@@ -302,6 +302,7 @@ internal class KlibVerificationTests : BaseKotlinGradleTest() {
       }
       runner {
         arguments.add(":apiCheck")
+        gradleJvmArgs += "-Xmx4g"
       }
     }