Bump react-addons-shallow-compare to 15.6.3

[mangnus]

react-native-snap-carousel@4.0.0-beta.6 requires node-fetch@^1.0.1 via a transitive dependency on isomorphic-fetch@2.2.1

The earliest fixed version of node-fetch is 2.6.7

Platforms affected

What does this PR do?

Update react-addons-shallow-compare dependency version from 15.6.2 to 15.6.3 to fix node-fetch vulnerability

What testing has been done on this change?

• Integration with our project codebase (testing in progress)

Tested features checklist

• Default setup (example)
• Carousels with and without momentum enabled (prop enableMomentum)
• Vertical carousels (prop vertical)
• Slide alignment (prop activeSlideAlignment)
• Autoplay (prop autoplay)
• Loop mode (prop loop)
• ScrollView/FlatList carousels (prop useScrollView)
• Callback methods
• ParallaxImage component
• Pagination component
• Layouts and custom interpolations