Array field UpdateMany - $set as object instead of $push array

Thank you so much ❤️ for all the great work and effort.

I have found a potential bug:

When you use `updateMany` resolver on array field it is executed on mongoose as `$set.0 - $set.1 - ....` and this result of the mongodb field data type to become Object instead of Array

For example
```
# mongoose
const userSchema = new Schema(
{
companies: {
type: [Schema.Types.ObjectId],
ref: 'Company',
}
});

schemaComposer.Mutation.addFields({
userUpdateMany: userTC.mongooseResolvers.updateMany(),
});

```
```
# graphql
mutation updateUser {
userUpdateMany(
filter: { email: "email@email.com" }
record: { companies: ["625b27bdada2c1e426941971", "625b27bdada2c1e426941971"] }
) {
numAffected
}
}
```
```
# the result query is like this
Mongoose: users.updateMany({ email: 'email@email.com' }, { '$setOnInsert': { createdAt: new Date("Sun, 17 Apr 2022 01:55:38 GMT") }, '$set': { 'companies.0': new ObjectId("625b27bdada2c1e426941971"), 'companies.1': new ObjectId("625b27bdada2c1e426941971"), updatedAt: new Date("Sun, 17 Apr 2022 01:55:38 GMT") }}, { limit: 100, multi: true })

```

So the companies field becomes object because it's first time set.

Ideally, updateMany should $set the whole array not the indexes. so the query should be like

```
users.updateMany({ '$set': { 'companies': [new ObjectId("625b27bdada2c1e426941971")] } });
```

Using `UpdateOne` works as expected - this issues is only with updateMany.