fix: Avoid properties added in dart_style v2.3.7

[koji-1009]

What does this change?

Removed DartFormatter.latestLanguageVersion and modified it to work with dart_style 2.2.4.

Fixes #651 🎯

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open a GitHub issue as a bug/feature request before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
  • Ensure the tests (melos run test)
  • Ensure the analyzer and formatter pass (melos run format to automatically apply formatting)
• Appropriate docs were updated (if necessary)

[AlexV525]

We have two options to solve the problem, as I thought:

1. Use a dynamic caller that can construct with and without the languageVersion field but bypass the analyzer check at the same time.
2. Raise the constraint to ^3.

If 1 is inapplicable, then we should go with 2.

[AlexV525]

And 3: raise the constraint to >=2.3.7.

[koji-1009]

Sorry. I had overlooked that languageVersion is optional in v2.3.7 but requierd in v3.0.0.

https://github.com/dart-lang/dart_style/blob/v2.3.7/lib/src/dart_formatter.dart#L83
https://github.com/dart-lang/dart_style/blob/v3.0.0/lib/src/dart_formatter.dart#L82

[AlexV525]

I'm closing this as #653 should resolve the issue without removing the field. Thanks for the contribution!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (778be81) to head (71bffb4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##             main   #652       +/-   ##
=========================================
- Coverage   97.55%      0   -97.56%     
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  Files          21      0       -21     
  Lines         819      0      -819     
=========================================
- Hits          799      0      -799     
+ Misses         20      0       -20     

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