build: bump deps

[lcdsmao]

What does this change?

Bump

• dartx 1.0.0
• json_serializable 6.0.0

Build
Use melos bootstrap instead of melos run pub:get, so we don't need ovrride_dpenedencies.

[codecov]

Codecov Report

Merging #182 (9cd3899) into main (972eefe) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
+ Coverage   98.93%   98.95%   +0.01%     
==========================================
  Files          19       19              
  Lines         565      574       +9     
==========================================
+ Hits          559      568       +9     
  Misses          6        6              

Impacted Files	Coverage Δ
packages/core/lib/settings/pubspec.g.dart	100.00% <0.00%> (ø)
packages/core/lib/generators/assets_generator.dart	100.00% <0.00%> (ø)

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