[K/N] Deprecated freezing ^KT-50541

Starting with 1.7.20 freezing is deprecated. See https://github.com/JetBrains/kotlin/blob/master/kotlin-native/NEW_MM.md#freezing-deprecation for details.

Merge-request: KT-MR-6399
Merged-by: Alexander Shabalin <Alexander.Shabalin@jetbrains.com>

kotlin-native/backend.native/tests/interop/objc/illegal_sharing.kt

@@ -1,3 +1,5 @@
+@file:OptIn(FreezingIsDeprecated::class)
+
 import kotlin.native.concurrent.*
 import kotlin.test.*
 import platform.Foundation.*

kotlin-native/backend.native/tests/interop/objc/tests/objcWeakRefs.kt

@@ -1,3 +1,5 @@
+@file:OptIn(FreezingIsDeprecated::class)
+
 import kotlinx.cinterop.*
 import kotlin.native.concurrent.*
 import kotlin.test.*

kotlin-native/backend.native/tests/interop/objc/tests/sharing.kt

@@ -1,3 +1,5 @@
+@file:OptIn(FreezingIsDeprecated::class)
+
 import kotlinx.cinterop.*
 import kotlin.native.concurrent.*
 import kotlin.test.*

kotlin-native/backend.native/tests/interop/objc/tests/utils.kt

@@ -1,3 +1,5 @@
+@file:OptIn(FreezingIsDeprecated::class)
+
 import kotlinx.cinterop.*
 import kotlin.native.concurrent.*
 import objcTests.*

kotlin-native/backend.native/tests/interop/objc/tests/workerAutoreleasePool.kt

@@ -1,3 +1,5 @@
+@file:OptIn(FreezingIsDeprecated::class)
+
 import kotlin.native.concurrent.*
 import kotlinx.cinterop.*
 import kotlin.test.*