fix(many-to-one): remove deprecated code

[goldcaddy77]

No description provided.

[codecov]

Codecov Report

Merging #211 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #211      +/-   ##
==========================================
+ Coverage    90.7%   90.75%   +0.05%     
==========================================
  Files          67       67              
  Lines        1398     1396       -2     
  Branches      295      293       -2     
==========================================
- Hits         1268     1267       -1     
+ Misses        130      129       -1

Flag	Coverage Δ
#backend	90.75% <100%> (+0.05%)	⬆️

Impacted Files	Coverage Δ
src/decorators/ManyToOne.ts	100% <100%> (+5.55%)	⬆️

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[goldcaddy77]

🎉 This PR is included in version 1.42.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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