DOC: add pandas 3.0 migration guide for the string dtype (#61705) #24312

Job	Run time
python-dev	0s
Linux-Musl	15m 20s
Pyodide build	23m 17s
Linux-32-bit	18m 7s
macos-13 actions-311.yaml	47m 11s
macos-13 actions-312.yaml	37m 48s
macos-14 actions-310.yaml	27m 6s
macos-13 actions-313.yaml	48m 33s
windows-latest actions-311.yaml	34m 20s
macos-14 actions-313.yaml	30m 26s
macos-14 actions-311.yaml	25m 36s
windows-latest actions-312.yaml	36m 45s
macos-14 actions-312.yaml	20m 31s
macos-13 actions-310.yaml	23m 38s
windows-latest actions-313.yaml	40m 46s
windows-latest actions-310.yaml	34m 11s
ubuntu-24.04 actions-313.yaml	46m 56s
Freethreading	22m 5s
ubuntu-24.04-arm actions-312.yaml	35m 36s
ubuntu-24.04-arm actions-313.yaml	36m 31s
Locale: it_IT	24m 6s
Pypy	1m 25s
Minimum Versions	23m 19s
Numpy Dev	16m 35s
Downstream Compat	5m 17s
Pyarrow Nightly	20m 19s
ubuntu-24.04-arm actions-311.yaml	35m 47s
ubuntu-24.04 actions-311.yaml	42m 21s
Future infer strings (without pyarrow)	38m 6s
ubuntu-24.04 actions-312.yaml	42m 43s
ubuntu-24.04-arm actions-310.yaml	36m 47s
Future infer strings	46m 13s
Locale: zh_CN	23m 53s
ubuntu-24.04 actions-310.yaml	45m 51s
	16h 47m 25s

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