Support latest firebase_storage version

[Peng-Qian]

Hi 👋,

Please update flutter_cache_manager_firebase to support the latest firebase_storage version~

[sidrao2006]

It seems that this change was landed in #295 and is available in v2.0.0

[renefloor]

Not sure which version this was about 😅, but now it supports >=8 <11.