fix(runtime-core): avoid number type transition child key duplicating with index key

[yuwu9145]

close #5761

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[yuwu9145]

I will add tests soon

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Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+24 B)	37.7 kB (+2 B)	33.9 kB (-33 B)
vue.global.prod.js	159 kB (+24 B)	57.5 kB	51.2 kB (+60 B)

Usages

Name	Size	Gzip	Brotli
createApp	55.1 kB	21.2 kB	19.3 kB
createSSRApp	59.1 kB	22.9 kB	20.8 kB
defineCustomElement	59.8 kB	22.7 kB	20.7 kB
overall	68.8 kB (+24 B)	26.3 kB (+3 B)	23.9 kB (+13 B)

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commit: 0fbfb31