Bump json_serializable/json_annotation versions

[lrsvmb]

Closes #1105.

Maybe modify the changelog as well?

Local tests passing.

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[rrousselGit]

What's the purpose in such a change? Freezed doesn't rely on features from the latest version.

[lrsvmb]

json_serializable: ^6.7.0 allows for record types which I wanted to look into further, but you are right; that might not be necessary atm. Will close.

[rrousselGit]

There's no public dependency on json_serializable. Only dev_dependency

So you can use any json_serializable version