fix: use currentlyFocusedInput for latest RN (#1010)

Replaced the currentlyFocusedField method with currentlyFocusedInput method. This fixes the error "currentlyFocusedField is deprecated and will be removed in a future release. Use currentlyFocusedInput".

### Motivation
CurrentlyFocusedField is deprecated.
Error being thrown when swiping with react-navigation. 

Co-authored-by: Satyajit Sahoo <satyajit.happy@gmail.com>

src/Pager.tsx

@@ -621,7 +621,9 @@ export default class Pager<T extends Route> extends React.Component<
               this.interactionHandle = InteractionManager.createInteractionHandle();
 
               if (keyboardDismissMode === 'auto') {
-                const input = TextInput.State.currentlyFocusedField();
+                const input = TextInput.State.currentlyFocusedInput
+                	? TextInput.State.currentlyFocusedInput()
+                	: TextInput.State.currentlyFocusedField();
 
                 // When a gesture begins, blur the currently focused input
                 TextInput.State.blurTextInput(input);