Update dependencies / powersync v1.1.0

[rkistner]

powersync package:

• v1.1.0
• Update sqlite_async dependency:
  • Supports catching errors in transactions and continuing the transaction.
  • Add tx.closed and db/tx.getAutoCommit()
• Update uuid dependency:
  • Now uses CryptoRNG from uuid package now that the performance improvements are upstream.
• Requires Dart ^3.2.0 / Flutter ^3.16.0.

powersync_attachments_helper package:

• v0.1.4
• Update dependencies.
• Declare support for Windows, MacOS and Linux platforms.

[rkistner]

The pana check fails on powersync_attachments_helper due to the powersync 1.1.0 dependency not being published yet. I'll manually rerun the check before publishing.