Release checklist: v0.4.8

[github-actions]

This is a checklist to track the release of v0.4.8.

Core build (this repo):

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

SQLite + powersync bundles:

• react-native-quick-sqlite: Update core extension to 0.4.8 react-native-quick-sqlite#99
• wa-sqlite build: Update core extension to 0.4.8 wa-sqlite#51
• sql.js dev adapter: Prepare trusted publishing, update core extension powersync-sql-js#14

User-facing SDK updates:

• powersync.dart: Update PowerSync core to 0.4.8 powersync.dart#344
• powersync-js:
• kotlin: Update core extension to 0.4.8 powersync-kotlin#279
• swift: Update Kotlin SDK and core extension powersync-swift#83