Update dependency json_serializable to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
json_serializable	dependencies	major	^5.0.2 -> ^6.0.0

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Release Notes

google/json_serializable.dart

v6.2.0

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v6.1.6

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v6.1.5

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v6.1.4

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v6.1.3

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v6.1.2

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v6.1.1

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v6.1.0

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v6.0.1

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v6.0.0

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Configuration

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[codecov-commenter]

Codecov Report

Merging #96 (d5750a4) into main (c9c35dc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #96   +/-   ##
=======================================
  Coverage   53.36%   53.36%           
=======================================
  Files          41       41           
  Lines         549      549           
=======================================
  Hits          293      293           
  Misses        256      256           

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