[DOC]: Please, update dependencies

[osmirnova-voc]

Because no versions of pushy_flutter match >2.0.18 <3.0.0 and pushy_flutter 2.0.18 depends on js ^0.6.5, pushy_flutter ^2.0.18 requires js ^0.6.5.
And because flutter_sound >=9.4.6 depends on flutter_sound_web 9.4.6 which depends on js ^0.7.1, pushy_flutter ^2.0.18 is incompatible with flutter_sound >=9.4.6.
So, because voccent depends on both flutter_sound ^9.4.6 and pushy_flutter ^2.0.18, version solving failed.