Update app.py

app.py

@@ -17,7 +17,7 @@ VOICE_MAP = {
     "en": {"gendered": True, "male": "en_GB-alan-medium", "female": "en_GB-semaine-medium"},
     "es": {"gendered": True, "male": "es_ES-sharvard-medium", "female": "es_ES-davefx-medium"},
     "fr": {"gendered": True, "male": "fr_FR-upmc-medium", "female": "fr_FR-siwis-medium"},
-    "de": {"gendered": True, "male": "de_DE-thorsten-medium", "female": "de_DE-mls-medium"},
+    "de": {"gendered": True, "male": "de_DE-thorsten-medium", "female": "de_DE-kerstin-low"},
     "it": {"gendered": True, "male": "it_IT-riccardo-x_low", "female": "it_IT-paola-medium"},
     "pl": {"gendered": True, "male": "pl_PL-darkman-medium", "female": "pl_PL-gosia-medium"},
     "uk": {"gendered": True, "male": "uk_UA-ukrainian_tts-medium", "female": "uk_UA-lada-x_low"},