fix: use pydantic UUID4 when generating pydantic models.

[mhils]

This PR updates pydantic model generation to use pydantic.UUID4 instead of uuid.uuid4. The latter crashes pydantic. 🙃 Thank you for the fantastic library!

[codecov]

Codecov Report

Merging #247 (88000df) into master (29bd374) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #247   +/-   ##
=======================================
  Coverage   99.37%   99.38%           
=======================================
  Files          14       15    +1     
  Lines        1283     1291    +8     
  Branches      264      218   -46     
=======================================
+ Hits         1275     1283    +8     
  Misses          3        3           
  Partials        5        5           

Impacted Files	Coverage Δ
...avroschema/model_generator/avro_to_python_utils.py	100.00% <100.00%> (ø)
...taclasses_avroschema/model_generator/base_class.py	100.00% <100.00%> (ø)
...ataclasses_avroschema/model_generator/generator.py	99.10% <100.00%> (ø)

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[marcosschroh]

Thanks @mhils It looks good !! :-)