Release checklist: 0.4.3

[simolus3]

This is a checklist to track the release of 0.4.3.

Core build (this repo):

• GitHub Release
• Android aar released on Maven Central
• Cocoapod released

SQLite + powersync bundles:

• react-native-quick-sqlite:
• wa-sqlite build:
• sql.js dev adapter:

User-facing SDK updates:

• powersync.dart:
• powersync-js:
• kotlin:
• swift:

[simolus3]

Aborting this release due to a regression.