remove unused dtype from MultiIndex constructor #22056

Job	Run time
Pyodide build	18m 45s
Linux-32-bit	18m 21s
Linux-Musl	16m 23s
python-freethreading	18m 44s
python-dev (macOS-13)	18m 47s
python-dev (macOS-14)	11m 48s
python-dev (ubuntu-22.04)	18m 43s
python-dev (windows-latest)	18m 41s
macos-13 actions-310.yaml	18m 50s
macos-13 actions-311.yaml	18m 48s
macos-13 actions-312.yaml	18m 52s
macos-14 actions-310.yaml	18m 47s
macos-14 actions-311.yaml	17m 45s
macos-14 actions-312.yaml	18m 46s
windows-latest actions-311.yaml	18m 44s
windows-latest actions-312.yaml	18m 43s
windows-latest actions-310.yaml	18m 42s
Minimum Versions	18m 48s
Future infer strings (without pyarrow)	23m 30s
Locale: zh_CN	18m 46s
Locale: it_IT	18m 46s
Downstream Compat	5m 54s
Pyarrow Nightly	18m 45s
Numpy Dev	18m 15s
Future infer strings	23m 30s
Pypy	1m 20s
ubuntu-22.04 actions-310.yaml	23m 29s
ubuntu-22.04 actions-311.yaml	23m 28s
ubuntu-22.04 actions-312.yaml	23m 28s
ubuntu-24.04-arm actions-311.yaml	23m 28s
ubuntu-24.04-arm actions-312.yaml	23m 28s
ubuntu-24.04-arm actions-310.yaml	23m 29s
	9h 56m 33s

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