fix: generate valid avro schemas when inheritance has multiple levels

[marcosschroh]

No description provided.

[codecov]

Codecov Report

Merging #140 (d848ede) into master (caf4645) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #140   +/-   ##
=======================================
  Coverage   99.62%   99.62%           
=======================================
  Files           9        9           
  Lines         793      793           
  Branches      123      123           
=======================================
  Hits          790      790           
  Misses          2        2           
  Partials        1        1           

Impacted Files	Coverage Δ
dataclasses_avroschema/fields.py	99.55% <100.00%> (+<0.01%)	⬆️
dataclasses_avroschema/schema_generator.py	100.00% <100.00%> (ø)

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