Update dependencies primarily for code generator and small linting fixes. Support analyzer 6.0

[juancastillo0]

Closes #13

Update dependencies primarily for code generator and small linting fixes.

Support analyzer 6.0

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (3e7351f) 86.32% compared to head (7d8213a) 86.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   86.32%   86.21%   -0.12%     
==========================================
  Files         110      110              
  Lines        7158     7137      -21     
==========================================
- Hits         6179     6153      -26     
- Misses        979      984       +5     

Files	Coverage Δ
chat_example/server/lib/users/user_api.dart	71.64% <100.00%> (-0.22%)	⬇️
leto/lib/src/extensions/cache_extension.dart	93.91% <ø> (ø)
leto/lib/src/graphql_result.dart	96.15% <ø> (ø)
leto_schema/lib/src/argument.dart	100.00% <100.00%> (ø)
leto_schema/lib/src/utilities/build_schema.dart	91.76% <100.00%> (-0.40%)	⬇️
.../src/validate/rules/known_argument_names_rule.dart	100.00% <ø> (ø)
leto_schema/lib/src/validate/validate_schema.dart	90.11% <ø> (-0.04%)	⬇️
...to_shelf/lib/src/graphql_ui/playground_config.dart	36.84% <ø> (ø)
leto_shelf/lib/src/graphql_ws.dart	90.90% <ø> (ø)
leto_shelf/lib/src/middlewares.dart	100.00% <ø> (ø)
... and 2 more

... and 7 files with indirect coverage changes

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