Adjust the dependency of vector_math

[XeLavend]

Currently syphon has these two dependencies in pubspec.yaml:

dependencies:
  ...
  flutter_localizations:
    sdk: flutter
  ...
  vector_math: 2.1.2
  ...

While flutter_localizations itself depends on another version of vector_math, namely 2.1.4:

dependencies:
  ...
  vector_math: 2.1.4
  ...

(Find more in https://github.com/flutter/flutter/blob/master/packages/flutter_localizations/pubspec.yaml)

As a result, executing flutter pub get or flutter pub upgrade alike ends up in:

flutter pub upgrade
Resolving dependencies...
Because syphon depends on flutter_localizations from sdk which depends on vector_math 2.1.4, vector_math 2.1.4 is required.
So, because syphon depends on vector_math 2.1.2, version solving failed.
pub finished with exit code 1

Is it appropriate to update the dependency of vector_math now?

[dnisbetjones]

Tagging @ereio for attention