Fix flow-type of selectionColor (#48184)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/48184

Changelog: [Internal]

Reviewed By: SamChou19815

Differential Revision: D66962089

fbshipit-source-id: cd45784d830a12a620800290235a5a1cad3097f3

packages/react-native/Libraries/Text/TextProps.js

@@ -17,7 +17,7 @@ import type {
   AccessibilityState,
   Role,
 } from '../Components/View/ViewAccessibility';
-import type {TextStyleProp} from '../StyleSheet/StyleSheet';
+import type {ColorValue, TextStyleProp} from '../StyleSheet/StyleSheet';
 import type {
   LayoutEvent,
   PointerEvent,
@@ -212,7 +212,7 @@ export type TextProps = $ReadOnly<{
    *
    * See https://reactnative.dev/docs/text#selectioncolor
    */
-  selectionColor?: ?string,
+  selectionColor?: ?ColorValue,
 
   dataDetectorType?: ?('phoneNumber' | 'link' | 'email' | 'none' | 'all'),
 

packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap

@@ -8574,7 +8574,7 @@ export type TextProps = $ReadOnly<{
   style?: ?TextStyleProp,
   testID?: ?string,
   disabled?: ?boolean,
-  selectionColor?: ?string,
+  selectionColor?: ?ColorValue,
   dataDetectorType?: ?(\\"phoneNumber\\" | \\"link\\" | \\"email\\" | \\"none\\" | \\"all\\"),
   textBreakStrategy?: ?(\\"balanced\\" | \\"highQuality\\" | \\"simple\\"),
   adjustsFontSizeToFit?: ?boolean,