Fix arrow groupby na #21622

Job	Run time
Linux-32-bit	18m 55s
Pyodide build	22m 51s
Linux-Musl	21m 0s
macos-13 actions-310.yaml	25m 52s
macos-13 actions-311.yaml	21m 24s
macos-13 actions-312.yaml	33m 8s
macos-14 actions-310.yaml	13m 58s
macos-14 actions-311.yaml	15m 59s
macos-14 actions-312.yaml	17m 39s
windows-latest actions-311.yaml	35m 38s
windows-latest actions-312.yaml	46m 6s
windows-latest actions-310.yaml	34m 22s
python-dev (macOS-13)	16m 36s
python-dev (macOS-14)	9m 34s
python-dev (ubuntu-22.04)	20m 35s
python-dev (windows-latest)	22m 53s
python-freethreading	22m 20s
Minimum Versions	23m 14s
Future infer strings (without pyarrow)	38m 52s
Locale: zh_CN	22m 58s
Locale: it_IT	23m 2s
Downstream Compat	5m 48s
Numpy Dev	16m 17s
Pyarrow Nightly	18m 53s
Future infer strings	47m 3s
Pypy	1m 16s
ubuntu-22.04 actions-310.yaml	44m 6s
ubuntu-22.04 actions-311.yaml	40m 13s
ubuntu-22.04 actions-312.yaml	43m 7s
ubuntu-24.04-arm actions-311.yaml	33m 15s
ubuntu-24.04-arm actions-312.yaml	37m 39s
ubuntu-24.04-arm actions-310.yaml	32m 57s
	13h 47m 30s

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