Upgrade mime package to 2.x

[mauriziopinotti]

Which packages are you using?

stream_chat_flutter, stream_chat_localizations

On what platforms did you experience the issue?

iOS, Android, Web

What version are you using?

stream_chat_flutter: ^8.3.0
stream_chat_localizations: ^8.3.0

What happened?

Because stream_chat_flutter >=8.3.0 depends on stream_chat_flutter_core ^8.3.0 which depends on stream_chat ^8.3.0, stream_chat_flutter >=8.3.0 requires stream_chat ^8.3.0.
And because stream_chat >=8.0.0 depends on mime ^1.0.5, stream_chat_flutter >=8.3.0 requires mime ^1.0.5.
So, because easyhour_app depends on both mime ^2.0.0 and stream_chat_flutter ^8.3.0, version solving failed.

Steps to reproduce

1. Create a new project and add `stream_chat_flutter: ^8.3.0` and `mime: ^2.0.0` as dependencies
2. Tr to build the project

Supporting info to reproduce

Upgrading to mime 2.x should pretty straightforward, see https://pub.dev/packages/mime/changelog

Relevant log output

No response

Flutter analyze output

No response

Flutter doctor output

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[xsahil03x]

Should be fixed in #2068