Fix arrow groupby na #22037

Job	Run time
Linux-32-bit	2m 31s
Linux-Musl	2m 27s
python-freethreading	2m 38s
python-dev (macOS-13)	2m 46s
python-dev (macOS-14)	2m 29s
python-dev (ubuntu-22.04)	2m 42s
python-dev (windows-latest)	2m 35s
Pyodide build	2m 24s
macos-13 actions-310.yaml	2m 28s
macos-13 actions-311.yaml	2m 26s
macos-13 actions-312.yaml	2m 28s
macos-14 actions-310.yaml	2m 30s
macos-14 actions-311.yaml	2m 29s
macos-14 actions-312.yaml	2m 29s
windows-latest actions-312.yaml	2m 25s
windows-latest actions-311.yaml	2m 24s
Minimum Versions	2m 52s
windows-latest actions-310.yaml	2m 28s
Future infer strings (without pyarrow)	2m 28s
Locale: zh_CN	2m 28s
Locale: it_IT	2m 29s
Downstream Compat	2m 52s
Numpy Dev	2m 44s
Future infer strings	2m 28s
Pyarrow Nightly	2m 47s
Pypy	3m 58s
ubuntu-22.04 actions-310.yaml	2m 31s
ubuntu-22.04 actions-311.yaml	2m 26s
ubuntu-24.04-arm actions-311.yaml	2m 26s
ubuntu-22.04 actions-312.yaml	2m 28s
ubuntu-24.04-arm actions-312.yaml	2m 25s
ubuntu-24.04-arm actions-310.yaml	2m 25s
	1h 22m 26s

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