Update dependency enum_to_string to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
enum_to_string	dependencies	major	^1.0.14 → ^2.0.0

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Release Notes

rknell/flutterEnumsToString (enum_to_string)

v2.2.1

• Performance improvements:
  • Optimized _getCustomMapping method to avoid throwing exceptions for enums without custom values
  • Added caching for string representations of enum values in fromString method to avoid repeated conversions
  • Fixed performance regression reported in issues #​35 and #​36
  • Added benchmark tests to measure performance improvements

v2.2.0

• Added support for enhanced enums (Dart 2.17+)
• Added ability to use custom string mappings with enhanced enums
• Minimum SDK version increased to 2.17.0

v2.1.0

• Added new capitalizeWords flag to control word capitalization in camelCase conversion
• When used with camelCase: true, setting capitalizeWords: true will capitalize all words instead of just the first one
• Maintains backward compatibility with existing behavior

v2.0.1

• No reason not to be bumped to prod with null safety

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⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

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The artifact failure details are included below:

File name: pubspec.lock

Command failed: flutter pub upgrade enum_to_string
The current Dart SDK version is 2.10.5.

Because flutter_new_instagram depends on enum_to_string >=2.0.0-nullsafety.1 which requires SDK version >=2.12.0-0 <4.0.0, version solving failed.
pub upgrade failed (1; Because flutter_new_instagram depends on enum_to_string >=2.0.0-nullsafety.1 which requires SDK version >=2.12.0-0 <4.0.0, version solving failed.)