fix(deps): update dependency flutter_typeahead to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
flutter_typeahead	dependencies	major	^5.2.0 → ^6.0.0

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Release Notes

AbdulRahmanAlHamali/flutter_typeahead (flutter_typeahead)

v6.0.0

Compare Source

Added

• Highlighted suggestion in controller
• constrainWidth parameter for suggestions box
• Exported type aliases and default builders

Changed

• Suggestion highlight is tracked by index on the controller instead of focus

Fixed

• Suggestions box resizes on scroll
• Guard overlay render box access
• Retain suggestions on loading

Removed

• hideWithKeyboard parameter (use hideOnUnfocus)
• flutter_keyboard_visibility dependency
• pointer_interceptor dependency

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