Update URL in ImageSource.d.ts documentation

[ergenekonyigit]

Summary:

This PR updates the @see reference URL in ImageSource.d.ts to reflect the current repository structure.

The React Native repository has undergone the following changes:

• The default branch was renamed from master to main
• The file path changed from Libraries/Image/ImageSource.js to packages/react-native/Libraries/Image/ImageSource.js

Before:

/*
 * @see https://github.com/facebook/react-native/blob/master/Libraries/Image/ImageSource.js
 */

After:

/*
 * @see https://github.com/facebook/react-native/blob/main/packages/react-native/Libraries/Image/ImageSource.js
 */

Changelog:

[GENERAL] [FIXED] - Update ImageSource.d.ts @see reference URL to reflect current repository structure

Test Plan:

CI Green