ossgo

Results 2 issues of ossgo

## 🐛 Bug Report The error message encountered with synthesizeToFile is: E/TextToSpeech(17968): Opening file tts.wav failed E/TextToSpeech(17968): java.io.FileNotFoundException: open failed: EROFS (Read-only file system) E/TextToSpeech(17968): at android.os.ParcelFileDescriptor.openInternal(ParcelFileDescriptor.java:342) E/TextToSpeech(17968): at android.os.ParcelFileDescriptor.open(ParcelFileDescriptor.java:229)...

When a task is completed and there is a delay at line 159, calling _queueUpNext at line 162 may potentially result in exceeding the maximum concurrent execution limit.