remove version identifiers for MeloTTS

Signed-off-by: Rene Leonhardt <[email protected]>

backend/python/openvoice/requirements.txt

@@ -1,17 +1,17 @@
 grpcio==1.64.1
 protobuf
-librosa==0.9.1
-faster-whisper==0.9.0
+librosa
+faster-whisper
 pydub==0.25.1
 wavmark==0.0.3
-numpy==1.26.4
+numpy
 eng_to_ipa==0.0.2
-inflect==7.0.0
-unidecode==1.3.7
-whisper-timestamped==1.14.2
+inflect
+unidecode
+whisper-timestamped
 openai
 python-dotenv
-pypinyin==0.50.0
+pypinyin
 cn2an==0.5.22
 jieba==0.42.1
 gradio