Bump json_serializable from 6.3.1 to 6.5.1

Created by: dependabot[bot]

Bumps json_serializable from 6.3.1 to 6.5.1.

Commits

• 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)
• 9b8050c json_serializable: fix readme spelling, DRY up some type logic (#1212)
• f94edb2 Fix a bug when annotated classes also use mixins (#1211)
• 89d75b9 Add more documentation about JsonEnum (#1209)
• c844625 json_serializable: prepare to release v6.4.0 (#1206)
• feadf4c json_serializable: more enum util cleanup (#1205)
• Additional commits viewable in compare view

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