[@loopback/sequelize] Typescript error when using the "required" property with Sequelize

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### Describe the bug

When trying to use the new "required: true" to use an Inner Join instead of a Left Join, it leads to a Typescript error:
```
Type '{ relation: string; scope: { where: { id: number; }; }; required: true; }'
is not assignable to type 'InclusionFilter'.
Object literal may only specify known properties, and 'required'
does not exist in type 'Inclusion'.

53 required: true
```

This also happens for nested relation operations such as:
```
myRepository(foreignKey).find({
include: [
{
// ...
required: true
}
]
}
```

### Logs

_No response_

### Additional information


### Reproduction

https://codesandbox.io/p/devbox/loopback-sequelize-types-24l36w

Commencez par la reproduction CodeSandbox liée et inspectez les types InclusionFilter et Inclusion impliqués dans l'erreur TypeScript. Confirmez comment l'extension Sequelize représente les includes imbriqués, puis vérifiez que required: true est accepté et que la reproduction compile pour les deux opérations de relation.

Rédigé par le modèle d'indexation à partir du texte de l'issue.