feat: upgrade to Dart 3.3.0 and Flutter 3.19.0

[eseidel]

Dart 3.3.0 just appeared on stable this morning:
https://github.com/dart-lang/sdk/tree/stable

My sense from experience is that that means Flutter isn't far behind.

We're blocked on fixing #1698 due to dart-lang/sdk#54860 affecting .dill generation, which we currently use upstream Dart for (not our fork). It would take a bunch of work for us to modify our infrastructure (and Dart code) to vend a patched dart binary (we don't test our modified Dart in JIT mode at all currently), so instead we're going to start the upgrade.

Steps I can see:

• Upgrade dart
• Upgrade build_root
• Upgrade flutter/engine
• Upgrade flutter/flutter

There will probably be a bunch of infra/tooling work relating to flutter/engine having moved to use signing for iOS. We may also need to request a cert from Apple.

[eseidel]

Our (needlessly internal) playbook on this: https://github.com/shorebirdtech/_shorebird/wiki/Shorebird-Release-Playbook#update-our-flutter-fork

[eseidel]

Flutter Beta:
Flutter: b7e7d46a046ba8a22897a514bf2311a0f81ab198
Engine: 98820f0a7716715df150f6adc5edd3444a088196
Dart: fe4b8016416d22afe75d8225f0c3f753b089c0b1
BuildRoot: 0141e94b34cbd3db77f28796587334857fa985da

[eseidel]

Cutler agrees:

 dart run bin/cutler.dart  versions --repo=flutter b7e7d46a046ba8a22897a514bf2311a0f81ab198
Using /Users/eseidel/Documents/GitHub as checkouts root.
✓ Checkouts updated! (6.7s)
Flutter b7e7d46a046ba8a22897a514bf2311a0f81ab198:
  flutter   b7e7d46a046ba8a22897a514bf2311a0f81ab198 (3.19.0-0.4.pre)
  engine    98820f0a7716715df150f6adc5edd3444a088196 (3.19.0-0.4.pre)
  dart      fe4b8016416d22afe75d8225f0c3f753b089c0b1 (3.3.0-279.3.beta)
  buildroot 0141e94b34cbd3db77f28796587334857fa985da

[eseidel]

Smoke test notes:

• e2e tests (https://github.com/shorebirdtech/shorebird/actions/runs/7851915851)

• engine tests (https://github.com/shorebirdtech/_build_engine/actions/runs/7851898873). Missing Xvfb on the machine. Presumably we should make our machines run the install_linux.sh as part of CI.

• flutter create + shorebird init works

• iOS release

• iOS patch

• iOS preview

• shorebird doctor

  • Win
  • Mac

• Android release

  • Win
  • Mac

• Android patch

  • Win
  • Mac

• Android preview

  • Win
  • Mac

• iOS Add to App release

• iOS Add to App patch

• Android Add to App release

  • Win
  • Mac

• Android Add to App patch

  • Win
  • Mac

• iOS Flavors release

• iOS Flavors patch

• iOS Flavors preview

• Android Flavors release

  • Win
  • Mac

• Android Flavors patch

  • Win
  • Mac

• Android Flavors preview

  • Win
  • Mac

[eseidel]

We decided to release this as a flutter-only release (no shorebird change) for now to avoid encouraging all of our customers to switch to the beta channel, only to have to switch back to stable again soon.

[felangel]

See #1698 (comment) for more info.

[eseidel]

Flutter 3.19.0:
  flutter   bae5e49bc2a867403c43b2aae2de8f8c33b037e4 (3.19.0)
  engine    04817c99c9fd4956f27505204f7e344335810aed (3.19.0)
  dart      25b3f65bf6264df5bd7cd6aca25cb68d47b9348b
  buildroot 0141e94b34cbd3db77f28796587334857fa985da

[eseidel]

Building engine: https://github.com/shorebirdtech/_build_engine/actions/runs/7921108381

[eseidel]

dart run bin/cutler.dart validate 3.19.0
Using /Users/eseidel/Documents/GitHub as checkouts root.
✓ Checkouts updated! (16.6s)
Validating 3.19.0
✅ flutter    refs/tags/3.19.0 matches upstream bae5e49bc2a867403c43b2aae2de8f8c33b037e4 (refs/tags/3.19.0)
✅ engine     refs/tags/3.19.0 matches upstream 04817c99c9fd4956f27505204f7e344335810aed (refs/tags/3.19.0)
✅ buildroot  correctly branched
✅ dart       correctly branched
✅ engine     correctly branched
✅ flutter    correctly branched