Bump json_serializable from 6.3.1 to 6.5.4

Created by: dependabot[bot]

Bumps json_serializable from 6.3.1 to 6.5.4.

Commits

• 2cfe92a Fix encoding nullable values with converters, prepare for release (#1231)
• 227da7a Fix handling of nullable enum fields with includeIfNull: false (#1227)
• fed0f2e Fix build (#1225)
• cc084e5 CI: use latest mono_repo (#1224)
• 5107ac1 Improve encoding of values to handle null cases (#1223)
• a79c6b7 Fix BigInt, DateTime, Uri JsonKey.defaultValue w/ a function (#1220)
• 0e89d96 Support Function values for JsonKey.default value (#1216)
• 7d3bf20 Latest mono_repo (#1215)
• f8dc218 changelog cleanup, add more examples to readme (#1213)
• aee8507 Support ConstructorElement (#1183)
• Additional commits viewable in compare view

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