This is a very popular question from singers and people that use their voice professionally. If the rhinoplasty is well performed and your nasal airway is improved or maintained, it will not change your voice. In fact, your resonance may improve due to the improved airflow through your nasal passages. Many well known international singers/performers have had rhinoplasty surgery. Best wishes.
Rhinoplasty should not impact voice to any significant degree. Best of luck with your decision to move forward.