TST: filter possible RuntimeWarning in tests #20966

Job	Run time
Linux-32-bit	18m 59s
Linux-Musl	21m 45s
Pyodide build	25m 34s
python-dev (macOS-13)	33m 25s
python-dev (macOS-14)	11m 11s
python-dev (ubuntu-22.04)	20m 19s
python-dev (windows-latest)	22m 30s
macos-13 actions-310.yaml	36m 30s
macos-13 actions-311.yaml	32m 2s
macos-13 actions-312.yaml	43m 36s
macos-14 actions-310.yaml	23m 11s
macos-14 actions-311.yaml	20m 7s
macos-14 actions-312.yaml	19m 50s
windows-latest actions-311.yaml	34m 55s
windows-latest actions-312.yaml	45m 24s
windows-latest actions-310.yaml	34m 42s
python-freethreading	29m 6s
ubuntu-latest actions-310.yaml	44m 55s
Minimum Versions	23m 35s
ubuntu-latest actions-311.yaml	41m 20s
Future infer strings (without pyarrow)	38m 44s
Locale: zh_CN	23m 29s
Locale: it_IT	23m 20s
Downstream Compat	5m 40s
Numpy Dev	16m 21s
Pyarrow Nightly	19m 26s
Pypy	1m 11s
ubuntu-latest actions-312.yaml	45m 1s
Future infer strings	47m 40s
	13h 23m 48s

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