Added flutter_math_fork dependency and updated the version of depend…

[Muhand]

This pull request is a solution to the issue Error: flutter_math_fork is missing implementation #58

Basically flutter_math_fork:^0.5.0 dependency was missing and it requires provider version ^6.0.0

[aelayyuu]

This pull request is a solution to the issue Error: flutter_math_fork is missing implementation #58

Basically flutter_math_fork:^0.5.0 dependency was missing and it requires provider version ^6.0.0

I've updated this player to flutter 3.0.5 and some of packages are updated. Please check my repo

https://github.com/aelayyuu/koel_player.git