CI Failing due to usage of some deprecated features

[roopak99]

Describe the bug
CI fails after #84 due to the following features ( accentColor, accentTextTheme and brightness )
These errors are thrown by flutter analyze and the log of it is attached below :

CI Flutter analyze log

Analyzing mobile-app...                                         

   info • 'accentColor' is deprecated and shouldn't be used. Use colorScheme.secondary instead. For more information, consult the migration guide at https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. This feature was deprecated after v2.3.0-0.1.pre. • lib/cv_theme.dart:56:9 • deprecated_member_use
   info • 'accentColor' is deprecated and shouldn't be used. No longer used by the framework, please remove any reference to it. For more information, consult the migration guide at https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. This feature was deprecated after v2.3.0-0.1.pre. • lib/ib_theme.dart:11:7 • deprecated_member_use
   info • 'accentTextTheme' is deprecated and shouldn't be used. No longer used by the framework, please remove any reference to it. For more information, consult the migration guide at https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. This feature was deprecated after v2.3.0-0.1.pre. • lib/ib_theme.dart:21:7 • deprecated_member_use
   info • 'accentTextTheme' is deprecated and shouldn't be used. No longer used by the framework, please remove any reference to it. For more information, consult the migration guide at https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. This feature was deprecated after v2.3.0-0.1.pre. • lib/ib_theme.dart:21:42 • deprecated_member_use
   info • 'accentColor' is deprecated and shouldn't be used. Use colorScheme.secondary instead. For more information, consult the migration guide at https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. This feature was deprecated after v2.3.0-0.1.pre. • lib/main.dart:43:15 • deprecated_member_use
   info • 'accentColor' is deprecated and shouldn't be used. Use colorScheme.secondary instead. For more information, consult the migration guide at https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#migration-guide. This feature was deprecated after v2.3.0-0.1.pre. • lib/main.dart:55:15 • deprecated_member_use
   info • 'brightness' is deprecated and shouldn't be used. This property is no longer used, please use systemOverlayStyle instead. This feature was deprecated after v2.4.0-0.0.pre. • lib/ui/views/ib/ib_landing_view.dart:71:7 • deprecated_member_use

7 issues found. (ran in 20.7s)

Checklist :

• accentColor depreciated, replace it with colorScheme.secondary
• accentTextTheme depreciated, replace it with colorScheme.secondary
• brightness depreciated, replace it with ThemeData.estimateBrightnessForColor()

More info: https://flutter.dev/docs/release/breaking-changes/theme-data-accent-properties#accentcolorbrightness
Welcome to Flutter 2.5 💯

edited by @manjotsidhu