add Spencer

Author: AdiSai

fern/providers/voice/vapi-voices.mdx

@@ -80,6 +80,13 @@ Vapi Voices is our carefully curated selection of high-quality voices designed t
 - **Characteristics**: Southern American accent
 - **Sample Audio**: <audio controls src="/static/audio/savannah_sample.wav">Your browser does not support the audio element.</audio>
 
+### Spencer
+- **Gender**: Female
+- **Accent**: American
+- **Age**: 26 years old
+- **Characteristics**: Energetic, quippy, lighthearted, cheeky, amused
+- **Sample Audio**: <audio controls src="/static/audio/spencer_sample.wav">Your browser does not support the audio element.</audio>
+
 ## How to Use
 
 1. Select a voice from our collection