The update-min-sdk command has been using explicitly ranges for the Dart
SDK, because that used to be required. Current versions of `pub` no
longer require that, and using `^` for Dart ranges is okay, so this
updates the tooling to use that format in the future.
Also removes the special casing that changed the upper bound from 3 to
4, since we have passed the point where we are generating upper bounds
less than 4 anyway.
To minimize churn, this doesn't update the existing pubspecs. We can
incrementally adopt this going forward as we roll dependencies forward.
Fixes https://github.com/flutter/flutter/issues/139806
Updates version-related checks for the 3.10 release:
- Updates the N-1 and N-2 tests to 3.3 and 3.7.
- Updates the minimum allowed SDK to declare support for to 3.3, matching our test matrix
- Updates all packages that were supporting <3.3 to 3.3 (and equivalent Dart versions for non-Flutter packages)
- Adds a Flutter->Dart mapping for 3.10 in the repo tooling.
As described in https://github.com/flutter/flutter/issues/121684, we currently have inconsistencies between Flutter SDK constraints and Dart SDK constraints; we have often updated only the former. This PR:
1. Adds CI enforcement via the repo tooling that the minimum versions are consistent.
2. Adds a new repo tooling command to update SDK constraints, to help mass-fix all the violations of the new enforcement in step 1 (and for future mass changes, such as when we update our test matrix and mass-drop support for versions that are no longe tested).
- In all cases, the looser constraint was updated to match the more restrictive constraint, such that there's no actual change in what Flutter version any package actually supports.
3. Runs `dart fix --apply` over all changed packages to automatically fix all of the analysis failures caused by step 2 suddenly making all of our packages able to use `super` parameters.
Fixes https://github.com/flutter/flutter/issues/121684
Fixes https://github.com/flutter/flutter/issues/121685
