Fix arrow groupby na #22038

Job	Run time
Pyodide build	23m 5s
Linux-32-bit	18m 2s
python-freethreading	23m 44s
Linux-Musl	16m 38s
python-dev (macOS-13)	31m 39s
python-dev (macOS-14)	9m 23s
python-dev (ubuntu-22.04)	21m 30s
python-dev (windows-latest)	22m 6s
macos-13 actions-310.yaml	36m 59s
macos-13 actions-311.yaml	43m 37s
macos-13 actions-312.yaml	34m 42s
macos-14 actions-310.yaml	26m 53s
macos-14 actions-311.yaml	28m 13s
macos-14 actions-312.yaml	31m 16s
windows-latest actions-312.yaml	58m 38s
windows-latest actions-311.yaml	44m 44s
windows-latest actions-310.yaml	46m 18s
Minimum Versions	23m 6s
Future infer strings (without pyarrow)	50m 31s
Downstream Compat	6m 17s
Locale: zh_CN	34m 28s
Locale: it_IT	34m 46s
Numpy Dev	16m 35s
Pyarrow Nightly	20m 13s
Future infer strings	59m 52s
ubuntu-22.04 actions-310.yaml	58m 14s
ubuntu-22.04 actions-311.yaml	57m 14s
Pypy	1m 37s
ubuntu-22.04 actions-312.yaml	1h 1m 13s
ubuntu-24.04-arm actions-311.yaml	47m 14s
ubuntu-24.04-arm actions-312.yaml	54m 14s
ubuntu-24.04-arm actions-310.yaml	51m 25s
	18h 14m 26s

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