Merge pull request #21221 from Yiiu/patch-1

[react-native]fix raw event arg ignored error in 'index.d.ts'.

types/react-native/index.d.ts

@@ -8047,7 +8047,7 @@ export namespace Animated {
      *```
      */
     export function event(
-        argMapping: Mapping[],
+        argMapping: Array<Mapping | null>,
         config?: EventConfig
     ): (...args: any[]) => void;