chore(repo): upgrade to flutter 3.0

[xsahil03x]

No description provided.

[codecov]

Codecov Report

Merging #1141 (f969b4a) into develop (d79ce76) will increase coverage by 0.21%.
The diff coverage is 53.16%.

@@             Coverage Diff             @@
##           develop    #1141      +/-   ##
===========================================
+ Coverage    67.92%   68.13%   +0.21%     
===========================================
  Files          229      229              
  Lines        23593    23426     -167     
===========================================
- Hits         16026    15962      -64     
+ Misses        7567     7464     -103     

Impacted Files	Coverage Δ
...eam_chat/lib/src/core/error/stream_chat_error.dart	88.23% <ø> (-0.23%)	⬇️
..._chat/lib/src/core/http/stream_chat_dio_error.dart	100.00% <ø> (ø)
...ckages/stream_chat/lib/src/core/models/filter.dart	100.00% <ø> (ø)
...ages/stream_chat/lib/src/core/models/own_user.dart	100.00% <ø> (ø)
...t_flutter/lib/src/attachment/attachment_title.dart	0.00% <ø> (ø)
...rc/attachment/attachment_upload_state_builder.dart	0.00% <0.00%> (ø)
..._flutter/lib/src/attachment/attachment_widget.dart	13.04% <ø> (-2.96%)	⬇️
...at_flutter/lib/src/attachment/file_attachment.dart	45.37% <ø> (-0.46%)	⬇️
...t_flutter/lib/src/attachment/giphy_attachment.dart	0.00% <ø> (ø)
...t_flutter/lib/src/attachment/image_attachment.dart	0.00% <ø> (ø)
... and 133 more

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