fix(ui, core): use CircularProgressIndicator.adaptive instead of material indicator.

[xsahil03x]

Fixes: #1540

[codecov-commenter]

Codecov Report

Patch coverage: 25.00% and project coverage change: -0.01 ⚠️

Comparison is base (94221ec) 58.48% compared to head (b9ce77f) 58.48%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1552      +/-   ##
===========================================
- Coverage    58.48%   58.48%   -0.01%     
===========================================
  Files          290      290              
  Lines        17656    17657       +1     
===========================================
  Hits         10326    10326              
- Misses        7330     7331       +1     

Impacted Files	Coverage Δ
...at_flutter/lib/src/attachment/file_attachment.dart	48.90% <ø> (ø)
...t_flutter/lib/src/attachment/giphy_attachment.dart	22.29% <ø> (ø)
...chment_actions_modal/attachment_actions_modal.dart	48.75% <0.00%> (-0.31%)	⬇️
...eam_chat_flutter/lib/src/channel/channel_info.dart	82.08% <ø> (ø)
...t_flutter/lib/src/channel/channel_list_header.dart	95.50% <ø> (ø)
...er/lib/src/fullscreen_media/full_screen_media.dart	42.43% <ø> (ø)
...r/lib/src/message_input/quoted_message_widget.dart	0.00% <ø> (ø)
...r/lib/src/message_list_view/loading_indicator.dart	61.53% <ø> (ø)
...r/lib/src/message_list_view/message_list_view.dart	44.82% <ø> (ø)
...m_chat_flutter_core/lib/src/message_list_core.dart	82.60% <ø> (ø)
... and 2 more

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