fix a typing annotation #10584

Job	Run time
Check whether we should run tests or not	10s
Notebook tests	7m 27s
HuggingFace Python 3.10 tests	3m 46s
Github API tests	4m 19s
Core TFDS tests / Generate shards	1s
Core TFDS tests / [Python 3.10][1/4]	7m 20s
Core TFDS tests / [Python 3.11][1/4]	6m 13s
Core TFDS tests / [Python 3.12][1/4]	6m 41s
Core TFDS tests / [Python 3.10][2/4]	5m 41s
Core TFDS tests / [Python 3.11][2/4]	4m 24s
Core TFDS tests / [Python 3.12][2/4]	6m 11s
Core TFDS tests / [Python 3.10][3/4]	6m 56s
Core TFDS tests / [Python 3.11][3/4]	5m 5s
Core TFDS tests / [Python 3.12][3/4]	7m 24s
Core TFDS tests / [Python 3.10][4/4]	6m 47s
Core TFDS tests / [Python 3.11][4/4]	5m 8s
Core TFDS tests / [Python 3.12][4/4]	6m 33s
	1h 30m 6s

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