Replace deprecated usages of max/min with maxOrNull/minOrNull

compiler/frontend/src/org/jetbrains/kotlin/resolve/deprecation/Deprecation.kt

@@ -117,7 +117,7 @@ internal data class DeprecatedByOverridden(private val deprecations: Collection<
         assert(deprecations.none { it is DeprecatedByOverridden })
     }
 
-    override val deprecationLevel: DeprecationLevelValue = deprecations.map(Deprecation::deprecationLevel).min()!!
+    override val deprecationLevel: DeprecationLevelValue = deprecations.map(Deprecation::deprecationLevel).minOrNull()!!
 
     override val target: DeclarationDescriptor
         get() = deprecations.first().target

compiler/frontend/src/org/jetbrains/kotlin/resolve/sinceKotlinUtil.kt

@@ -60,7 +60,7 @@ private data class SinceKotlinValue(
 private fun getSinceKotlinVersionByOverridden(descriptor: CallableMemberDescriptor): SinceKotlinValue? {
     // TODO: combine wasExperimentalMarkerClasses in case of several members with the same minimal API version
     return DescriptorUtils.getAllOverriddenDeclarations(descriptor).map { it.getOwnSinceKotlinVersion() ?: return null }
-        .minBy { it.apiVersion }
+        .minByOrNull { it.apiVersion }
 }
 
 /**