⬆️ Bump mashumaro to v3.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mashumaro	==3.20 → ==3.21

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Release Notes

Fatal1ty/mashumaro (mashumaro)

v3.21

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Changes

• Added support for recursive dataclasses in JSON Schema (#​308)
• Fixed building JSON Schema for dataclasses with slots (#​307)
• Fixed issue with deferred evaluation of annotations for serialization strategies and serializable types that include PEP 695 generic type parameters (#​310)
• Fixed errors for PEP 695 type aliases with generic arguments or cyclic references (#​311, #​312)
• Code coverage report tool coveralls.io was replaced by codecov.io (#​309)
• Fixed propagation of lazy_compilation config value in generic dataclasses with inheritance (#​319)
• Added ability for serialization strategies to match subclasses (#​298, #​317)
• Dropped support for Python 3.9 (#​314)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.82%. Comparing base (2ecce67) to head (e195608).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #170   +/-   ##
=======================================
  Coverage   91.82%   91.82%           
=======================================
  Files           5        5           
  Lines         159      159           
=======================================
  Hits          146      146           
  Misses         13       13           

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