fixing a backslash issue in f string

multispeaker-tts-sinhala.py

@@ -90,7 +90,7 @@ class SiTTS(datasets.GeneratorBasedBuilder):
 
             for id_, line in enumerate(lines):
                 sentence = re.findall(r'"(.*?)"', line)[0].strip()
-                file_path = f'{re.findall(r"(sin_[^\s]+)", line)[0]}.wav'
+                file_path = "{0}.wav".format(re.findall(r"(sin_[^\s]+)", line)[0])
                 field_values = [sentence, file_path]
 
                 # set absolute path for wav audio file