JSON v3 support

The breaking changes in json v3 cause issues for rack-contrib:

If you did depend on create_additions, the recommended migration is to implement a custom serializer using JSON::Coder.

rack-contrib's usage that is impacted by this change:

Line 43 in 9235386

DEFAULT_PARSER = ->(body) { JSON.parse(body, create_additions: false) }

Some additional context that might be worth reviewing:

We would welcome a PR.

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