TST/CI: Address enforced numpy DeprecationWarning in test_pandas_dtype_numpy_warning #21857

Job	Run time
Pyodide build	4m 22s
Linux-32-bit	4m 10s
Linux-Musl	4m 10s
python-freethreading	4m 28s
python-dev (macOS-13)	4m 25s
python-dev (macOS-14)	4m 24s
python-dev (windows-latest)	4m 17s
python-dev (ubuntu-22.04)	4m 23s
macos-13 actions-310.yaml	4m 17s
macos-13 actions-311.yaml	4m 23s
macos-13 actions-312.yaml	4m 27s
macos-14 actions-310.yaml	4m 23s
macos-14 actions-311.yaml	4m 24s
macos-14 actions-312.yaml	4m 28s
windows-latest actions-311.yaml	4m 17s
windows-latest actions-312.yaml	4m 16s
Minimum Versions	4m 24s
Future infer strings (without pyarrow)	4m 24s
Locale: zh_CN	4m 26s
windows-latest actions-310.yaml	4m 18s
Locale: it_IT	4m 25s
Downstream Compat	4m 26s
Numpy Dev	4m 25s
Pyarrow Nightly	4m 24s
Future infer strings	4m 25s
Pypy	1m 16s
ubuntu-22.04 actions-310.yaml	4m 25s
ubuntu-22.04 actions-311.yaml	4m 24s
ubuntu-22.04 actions-312.yaml	4m 25s
ubuntu-24.04-arm actions-311.yaml	4m 23s
ubuntu-24.04-arm actions-312.yaml	4s
ubuntu-24.04-arm actions-310.yaml	4m 22s
	2h 12m 30s

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