Update BelongsTo relation makes from old_values ID Integer insead of String type

[NoahNxT]

Q	A
Bug?	yes
New Feature?	no
Framework	Laravel
Framework version	9.48.0
Package version	13.0
PHP version	8.1

Actual Behaviour

When updatinga BelongsTo relation, the old_values id is parsed to an Int instead of a string.
This makes searching with whereJsonContains unpossible because you'll have to always check for both types

This is how I need to check in the audits table for a presence value now:

Audit::whereJsonContains('old_values', ['protocol_id' => $this->id])
            ->orWhereJsonContains('old_values', ['protocol_id' => (string)$this->id])
            ->orWhereJsonContains('new_values', ['protocol_id' => $this->id])
            ->exists();

Expected Behaviour

When updating a BelongsTo relation, the old_value of the id should be parsed to a string like any other action.

**old_values

"model_id":"9",

Steps to Reproduce

1. Make a belongsTo Many relation
2. Attach the BelongsTo
3. Update the BelongsTo
4. Now you can see the different type in the old_values column

Possible Solutions

Hard cast to (Int)

[parallels999]

Hi, feel free to make a PR to fix that, thanks