fix: mypy issues

[marcosschroh]

No description provided.

[codecov]

Codecov Report

Merging #186 (06712ad) into master (6093fe7) will decrease coverage by 0.21%.
The diff coverage is 97.70%.

❗ Current head 06712ad differs from pull request most recent head bf4bc51. Consider uploading reports for the commit bf4bc51 to get more accurate results

@@            Coverage Diff             @@
##           master     #186      +/-   ##
==========================================
- Coverage   99.77%   99.55%   -0.22%     
==========================================
  Files          10       10              
  Lines         879      898      +19     
  Branches      154      154              
==========================================
+ Hits          877      894      +17     
- Misses          1        2       +1     
- Partials        1        2       +1     

Impacted Files	Coverage Δ
dataclasses_avroschema/schema_definition.py	98.50% <87.50%> (-1.50%)	⬇️
dataclasses_avroschema/fields.py	99.36% <96.42%> (-0.21%)	⬇️
dataclasses_avroschema/avrodantic.py	100.00% <100.00%> (ø)
dataclasses_avroschema/schema_generator.py	100.00% <100.00%> (ø)
dataclasses_avroschema/serialization.py	100.00% <100.00%> (ø)
dataclasses_avroschema/types.py	100.00% <100.00%> (ø)
dataclasses_avroschema/utils.py	100.00% <100.00%> (ø)

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