fix(sync): accept file objects that have no path for a name

[RaphaelFakhri]

Summary

SyncTranscriber.transcribe() and AsyncSyncTranscriber.transcribe() read the audio part's filename from the file object's name attribute and pass it to os.path.basename(). Anonymous files, such as the result of tempfile.TemporaryFile() on POSIX, report a file descriptor (an int) as their name, so the call raises TypeError: expected str, bytes or os.PathLike object, not int. The streaming path, stream_filename() and the Dictation resolve_source() already use the name only when it is a str.

Changes

• assemblyai/_audio.py: use the file object's name only when it is a non-empty str. Otherwise the audio is sent under the default filename and Content-Type.
• tests/unit/test_sync.py: add a test that transcribes a tempfile.TemporaryFile() and checks the request body.

Testing

python -m pytest tests/unit/test_sync.py tests/unit/test_sync_async.py tests/unit/test_sync_live.py tests/unit/test_dictation.py tests/unit/test_audio_helpers.py tests/unit/test_sync_backwards_compat.py

Without the source change the new test fails with the TypeError. With the change, all 186 tests in these files pass.