[Snyk] Upgrade @react-native-async-storage/async-storage from 1.15.6 to 1.15.7

Snyk has created this PR to upgrade @react-native-async-storage/async-storage from 1.15.6 to 1.15.7.

merge advice :information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

The recommended version is 1 version ahead of your current version.
The recommended version was released 21 days ago, on 2021-08-23.

Release notes

Package name: @react-native-async-storage/async-storage

1.15.7 - 2021-08-23
1.15.7 (2021-08-23)

Bug Fixes
- mock: cannot use import statement outside a module (#661) (6f7b459)
- declare support for react-native 0.65 (#659) (5847d46)
1.15.6 - 2021-08-16
1.15.6 (2021-08-16)

Bug Fixes
- web : replace deprecated deep-assign with merge-options. Also, jest-mock uses now merge-options instead own implementation of deep merge (#657) (6fec1db)
Potential breaking change

With change of deep-assign with merge-options and it usage in jest-mock, there's a potential breaking change due to how deep-assign merged values. Previously, if value overriding was null or undefined, the previous value would stay the same. With current change, null value will override the original value, while undefined will not.

This might be a breaking change on web and tests, if you previously relied on this behavior.