BUG: Preserve timezone in numpy_dtype for ArrowDtype #20908

Job	Run time
Pyodide build	7m 43s
Linux-32-bit	7m 34s
Linux-Musl	7m 32s
python-dev (macOS-13)	7m 51s
python-dev (macOS-14)	7m 49s
python-dev (ubuntu-22.04)	7m 47s
python-dev (windows-latest)	7m 39s
macos-13 actions-310.yaml	7m 51s
macos-13 actions-311.yaml	7m 55s
macos-13 actions-312.yaml	7m 49s
macos-14 actions-310.yaml	7m 49s
macos-14 actions-311.yaml	7m 52s
macos-14 actions-312.yaml	7m 47s
windows-latest actions-311.yaml	7m 42s
windows-latest actions-312.yaml	7m 38s
windows-latest actions-310.yaml	7m 28s
python-freethreading	7m 45s
ubuntu-latest actions-310.yaml	12m 30s
Minimum Versions	7m 47s
ubuntu-latest actions-311.yaml	12m 32s
Future infer strings (without pyarrow)	12m 30s
Locale: zh_CN	7m 46s
Locale: it_IT	7m 47s
Downstream Compat	5m 42s
Numpy Dev	7m 46s
Pyarrow Nightly	7m 47s
ubuntu-latest actions-312.yaml	12m 30s
Future infer strings	12m 30s
Pypy	1m 37s
	4h 0m 15s

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