Fix related key in restifyjsSerialize

[rizkyseptiawan]

Fixed an error referencing the value of the key related array in the restifyjsSerialize function from static::collectFilters('matches') to static::collectRelated()

[what-the-diff]

PR Summary

• Enhanced Data Retrieval Method
  The way we get related data has been improved. Instead of using the old collectFilters('matches') method, we now use a more efficient one called collectRelated(). This should increase the performance of our data retrieval system.

[binaryk]

Thank you!