fix(validators): allow any values for isIn/notIn

[lukashroch]

This is a follow up of sequelize/sequelize#12962, which has now been fixed in sequelize 6.8.0. Since types are now fixed in sequelize, decorator types can now be correctly aligned with the implementation. Fixes #866.

[codecov]

Codecov Report

Merging #1124 (f04f3e7) into master (ea006fc) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1124   +/-   ##
=======================================
  Coverage   95.11%   95.11%           
=======================================
  Files         117      117           
  Lines        1125     1125           
  Branches      128      128           
=======================================
  Hits         1070     1070           
  Misses         23       23           
  Partials       32       32           

Impacted Files	Coverage Δ
src/validation/is-in.ts	100.00% <100.00%> (ø)
src/validation/not-in.ts	100.00% <100.00%> (ø)

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