Bump json_serializable from 6.3.1 to 6.4.1

Created by: dependabot[bot]

Bumps json_serializable from 6.3.1 to 6.4.1.

Commits

• 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)
• 12414e0 json_serialiable: make utility function private
• 52236b0 json_serializable: refactor enum logic (#1204)
• 9143b83 Add JsonEnum.valueField for encoding enhanced enum values (#1203)
• 572e813 json_serialiable: fix bug with pkg:build output in test (#1201)
• e30a519 latest pkg:analyzer, prepare to publish (#1200)
• b1cd6be latest mono_repo, ignore hints for now, use pubspec feature (#1197)
• Additional commits viewable in compare view

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