[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/performance/ring/src/main/kotlin-native/org/jetbrains/ring/Utils.kt

@@ -13,6 +13,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+// We benchmark both new and legacy MM.
+@file:OptIn(FreezingIsDeprecated::class)
 
 package org.jetbrains.ring