fix: use root reference to generate valid schemas in multiple inherit…

[marcosschroh]

…ance levels

[codecov]

Codecov Report

Merging #148 (c89d212) into master (09455f0) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #148   +/-   ##
=======================================
  Coverage   99.62%   99.62%           
=======================================
  Files           9        9           
  Lines         797      799    +2     
  Branches      124      125    +1     
=======================================
+ Hits          794      796    +2     
  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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