Properly transform nested array of input type classes

[MichalLytek]

Closes #734 🔒

[codecov]

Codecov Report

Merging #737 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #737      +/-   ##
==========================================
+ Coverage   95.33%   95.40%   +0.06%     
==========================================
  Files          80       80              
  Lines        1480     1479       -1     
  Branches      294      294              
==========================================
  Hits         1411     1411              
+ Misses         66       65       -1     
  Partials        3        3              

Impacted Files	Coverage Δ
src/resolvers/convert-args.ts	100.00% <100.00%> (ø)
src/schema/schema-generator.ts	98.00% <0.00%> (+0.32%)	⬆️

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[blueset]

Thank you for the fix!
I have applied the patch locally and it does fix the issue.