test: replace deprecated SpyInstance with MockInstance

[Alfred-Skyblue]

The SpyInstance type has been deprecated in vitest and is now marked as obsolete. According to the documentation, should replace it with MockInstance.

https://github.com/vitest-dev/vitest/blob/039814bd0eb9ed7b7f6e649a1c3def38d5174a5d/packages/spy/src/index.ts#L107-L110

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	87.1 kB	33.1 kB	29.9 kB
vue.global.prod.js	133 kB	50 kB	44.8 kB

Usages

Name	Size	Gzip	Brotli
createApp	48.4 kB	19 kB	17.4 kB
createSSRApp	51.6 kB	20.3 kB	18.5 kB
defineCustomElement	50.7 kB	19.8 kB	18.1 kB
overall	61.7 kB	23.9 kB	21.7 kB

[codspeed-hq]

CodSpeed Performance Report

Merging #9889 will not alter performance

_{Comparing Alfred-Skyblue:chore/vitest/type-deprecated (a0db20c) with main (9fa8241)}

Summary

✅ 53 untouched benchmarks