Bump up dependencies versions

[ndawod]

Hi, and thanks for the plugin!

There will be trouble for anyone wanting to use it, however, as it uses quite old dependencies of some plugins.

Because no versions of xml match >4.4.1 <5.0.0 and xml >=3.7.0 <4.4.0 depends on petitparser ^3.0.0, xml >=3.7.0 <4.4.0-∞ or >4.4.1 <5.0.0 requires petitparser ^3.0.0.
And because xml >=4.4.0 <4.4.1 depends on petitparser ^3.1.0 and xml 4.4.1 depends on petitparser ^3.0.0, xml >=3.7.0 <5.0.0 requires petitparser ^3.0.0.
And because flutter_svg 0.18.0 depends on xml ^4.1.0 and every version of lantern depends on petitparser ^2.4.0, flutter_svg 0.18.0 is incompatible with lantern.
So, because my_app depends on both lantern 0.0.6+3 and flutter_svg 0.18.0, version solving failed.
pub get failed (1; So, because my_app depends on both lantern 0.0.6+3 and flutter_svg 0.18.0, version solving failed.)

Recommended: upgrade dependencies as you bump versions. Make it a habbit to check for versions using flutter pub outdated.

Hope you'll release an update to address it, thank you again.