Update for PSPDFKit 10.2 for iOS, Xcode 12.4 and React Native 0.63.4

[radazzouz]

⚠️ Only merge once PSPDFKit 10.2 for iOS is released ⚠️

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Details

This PR updates the plugin for PSPDFKit 10.2 for iOS and Xcode 12.4

Acceptance Criteria

• When approved, right before merging, rebase with master and increment the package version in package.json, package-lock.json, samples/Catalog/package.json, and samples/NativeCatalog/package.json (see example commit: 1bf805f).
• Create a new release (and tag) with the new package version (see https://github.com/PSPDFKit/react-native/releases).

[steviki]

👍