fixing analysis errors

[amondnet]

Describe the changes proposed in this Pull Request.

If the PR fixes a specific issue, reference the issue with Fixes #.

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Pull Request Checklist

• If the changes are being made to code, ensure the version in pubspec.yaml is updated.
• Increment the major/minor/patch/patch-count, depending on the complexity of change
• Add the necessary unit tests to ensure the coverage does not drop
• Update the Changelog to include all changes made in this PR, organized by version
• Run the melos run set_version command from the root directory
• Include the necessary reviewers for the PR
• Update the docs if there are any API changes or additions to functionality

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.50%. Comparing base (0d2bcbb) to head (6fad6ea).

Additional details and impacted files

@@             Coverage Diff             @@
##              main    #1021      +/-   ##
===========================================
- Coverage   100.00%   99.50%   -0.50%     
===========================================
  Files            6       57      +51     
  Lines          100     2019    +1919     
===========================================
+ Hits           100     2009    +1909     
- Misses           0       10      +10     

Flag	Coverage Δ
flutter_mobx	100.00% <ø> (ø)
mobx	99.28% <ø> (?)
mobx_codegen	100.00% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
mobx_codegen/lib/src/type_names.dart	100.00% <ø> (ø)

... and 50 files with indirect coverage changes

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