Add support for Sequelize v7

[sdepold]

This seems to work well. We might want to consider adding @sequelize/core as a peer dependency somehow.

Fixes https://github.com/SoftwareBrothers/adminjs-sequelizejs/issues/123

[github-actions[bot]]

:tada: This PR is included in version 4.1.0 :tada:

The release is available on:

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

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