Remove dart:html

[JohnGalt1717]

Right now this is making any app that depends on biometric_storage incompatible with wasm.

Please update web to use the right libraries.

[hpoul]

@JohnGalt1717 are you sure? i think I've migrated away from dart:html in 5.1.0

[JohnGalt1717]

Latest version specifically is stated as a blocker for any project that depends on biometric storage if you pass the —wasm flag to build or run.