Use ConfigurationCompat for locale access in I18nManagerModule (#55663)

Summary:
Pull Request resolved: #55663

Replace the direct `configuration.locales[0]` call with `ConfigurationCompat.getLocales()` from AndroidX, which handles the API level check internally. Falls back to `Locale.getDefault()` if the locale list is empty.

Changelog: [Internal]

----

Reviewed By: mdvacca, NickGerleman

Differential Revision: D93943818

fbshipit-source-id: 8dd1e700a4b50e0c02c76ca8dbd2358b247a5df4

Author: alanleedev

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/i18nmanager/I18nManagerModule.kt

@@ -7,17 +7,20 @@
 
 package com.facebook.react.modules.i18nmanager
 
+import androidx.core.os.ConfigurationCompat
 import com.facebook.fbreact.specs.NativeI18nManagerSpec
 import com.facebook.react.bridge.ReactApplicationContext
 import com.facebook.react.module.annotations.ReactModule
+import java.util.Locale
 
 /** [com.facebook.react.bridge.NativeModule] that allows JS to set allowRTL and get isRTL status. */
 @ReactModule(name = NativeI18nManagerSpec.NAME)
 internal class I18nManagerModule(context: ReactApplicationContext?) :
     NativeI18nManagerSpec(context) {
   override fun getTypedExportedConstants(): Map<String, Any> {
     val context = reactApplicationContext
-    val locale = context.resources.configuration.locales[0]
+    val locale =
+        ConfigurationCompat.getLocales(context.resources.configuration)[0] ?: Locale.getDefault()
 
     return mapOf(
         "isRTL" to I18nUtil.instance.isRTL(context),