fix(types): Updated Types to match JavaScript implementation

[Keimeno]

Pull Request check-list

Please make sure to review and check all of these items:

• Does npm run test or npm run test-DIALECT pass with this change (including linting)?
• Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
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Description of change

Telling the ModelAttributeColumnOptions interface property references to accept strings as well.
This feature is actually implemented into sequelize, as can be seen in the documentation you need to search for attributes.column.references.

[codecov]

Codecov Report

Merging #12407 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #12407   +/-   ##
=======================================
  Coverage   96.44%   96.44%           
=======================================
  Files          95       95           
  Lines        9114     9114           
=======================================
  Hits         8790     8790           
  Misses        324      324           

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[sushantdhiman]

🎉 This PR is included in version 6.2.0 🎉

The release is available on:

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

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