Chore: Upgrade dependencies for Flutter 3.22 compatibility

[hjiangsu]

Pull Request Description

This PR upgrades the necessary dependencies to work with Flutter 3.22. This is still in draft as there are currently some packages which have been overridden in order to allow Flutter 3.22 compatibility. Once the official packages have been updated, this will be taken out of draft status. In particular:

• swipeable_page_route - awaiting for PR merge
  • Issue: Update to Flutter 3.22.0 JonasWanke/swipeable_page_route#52
  • PR: Replace isPopGestureInProgress(route) JonasWanke/swipeable_page_route#54
  • iOS PR: update to flutter 3.22.0 JonasWanke/swipeable_page_route#51
    • (I'm not sure if we need to wait for this one.)
• flutter_inappwebview_android (transitive dependency) - awaiting for PR merge
  • Issue: Build error with latest flutter/agp versions pichillilorenzo/flutter_inappwebview#2139
  • PR: Update proguard-rules.pro pichillilorenzo/flutter_inappwebview#2102
  • See also: fix: update proguard rules pichillilorenzo/flutter_inappwebview#2140
• flex_color_scheme - requires major version upgrade to work with Flutter 3.22 (WIP)
  • See: https://docs.flexcolorscheme.com/

There also needs to be some general testing to ensure no breaking changes resulting from this upgrade.

Issue Being Fixed

Issue Number: N/A

Screenshots / Recordings

Checklist

• Did you update CHANGELOG.md?
• Did you use localized strings where applicable?
• Did you add semanticLabels where applicable for accessibility?

[micahmo]

Note that I'm particularly interested in this PR because we need to upgrade to Flutter 3.22 in order to enable the new Impeller rendering engine for Android. I am optimistic that this will improve performance/smoothness on Android!

See more: https://docs.flutter.dev/perf/impeller#android

[hjiangsu]

Closing in favour of #1565