Bump fleather from 1.10.0 to 1.12.0

Bumps fleather from 1.10.0 to 1.12.0.

Release notes

Sourced from fleather's releases.

v1.12.0

• Introduce AutoFormats to handle automatic text formatting and make Heuristics only responsible for validity of document
• Show context menu on desktop
• Add unset background and text color option
• Handle more text editing intents (See #180 for the list)
• [Fix] toolbar button design
• [Fix] preserve line style on new line
• [Fix] example app build for Android

v1.11.0

• Support for Flutter 3.16
• [Fix] exception thrown when inserting new line with toggled inline styles

Commits

• cc0ea76 Release v1.12.0 (#193)
• 50baf00 Accept AutoFormats in FleatherController constructor (#194)
• 6cd43c4 Fix text direction auto format detection and undo (#191)
• 051a5a4 Preserve line style when entering new line (#190)
• 4c3e95f Auto formats (#181)
• 00b14a0 Handle more text editing intents (#189)
• c21a6c1 [Desktop] Remove contextual menu when selecting all (#188)
• cd886f0 Support for automatic mode in color selection buttons (#187)
• 416244c Homogeneous UI for toolbar buttons (#185)
• 6ba157f Show context menu on desktop (#179)
• Additional commits viewable in compare view

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