update to be compatible with xml ^5.1.2 and flutter_native_splash 2.3.4

[agelospanagiotakis]

Because every version of game_levels_scrolling_map depends on xml ^5.1.2 and flutter_native_splash 2.3.4 depends on xml ^6.3.0, game_levels_scrolling_map is incompatible with flutter_native_splash 2.3.4.
And because no versions of flutter_native_splash match >2.3.4 <3.0.0, game_levels_scrolling_map is incompatible with flutter_native_splash ^2.3.4.
So, because emoji_connect_game depends on both flutter_native_splash ^2.3.4 and game_levels_scrolling_map ^0.0.7, version solving failed.
exit code 1