Fix BUG: read_sql tries to convert blob/varbinary to string with pyarrow backend #21782

Job	Run time
Pyodide build	23m 24s
Linux-Musl	15m 38s
Linux-32-bit	18m 5s
python-freethreading	23m 6s
macos-13 actions-310.yaml	35m 2s
macos-13 actions-311.yaml	25m 22s
macos-13 actions-312.yaml	36m 48s
macos-14 actions-310.yaml	23m 24s
macos-14 actions-311.yaml	14m 18s
macos-14 actions-312.yaml	22m 12s
windows-latest actions-311.yaml	36m 24s
windows-latest actions-312.yaml	44m 32s
windows-latest actions-310.yaml	33m 24s
python-dev (macOS-13)	21m 35s
python-dev (macOS-14)	12m 51s
python-dev (ubuntu-22.04)	20m 33s
python-dev (windows-latest)	22m 29s
Minimum Versions	23m 5s
Future infer strings (without pyarrow)	41m 15s
Locale: zh_CN	25m 21s
Locale: it_IT	23m 35s
Downstream Compat	6m 16s
Numpy Dev	16m 34s
Pyarrow Nightly	21m 6s
Future infer strings	49m 59s
Pypy	1m 23s
ubuntu-22.04 actions-310.yaml	47m 51s
ubuntu-22.04 actions-311.yaml	44m 20s
ubuntu-22.04 actions-312.yaml	49m 14s
ubuntu-24.04-arm actions-311.yaml	20m 18s
ubuntu-24.04-arm actions-310.yaml	19m 32s
ubuntu-24.04-arm actions-312.yaml	23m 42s
	14h 2m 38s

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