fix: update slot key filtering to exclude internal keys

[edison1105]

We will add another internal key __, see https://github.com/vuejs/core/pull/13215/files

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
core.esm-browser.prod.js	38.05 kB	11.62 kB	10.39 kB
core.global.prod.js	31.11 kB	10.78 kB	9.67 kB
core.runtime.esm-browser.prod.js	23.77 kB	7.71 kB	6.90 kB
core.runtime.global.prod.js	18.08 kB	7.04 kB	6.32 kB
message-compiler.esm-browser.prod.js	19.29 kB	5.76 kB	5.14 kB
message-compiler.global.prod.js	17.32 kB	5.55 kB	4.98 kB
petite-vue-i18n-core.esm-browser.prod.js	20.67 kB	6.96 kB	6.26 kB
petite-vue-i18n-core.global.prod.js	15.63 kB	6.06 kB	5.51 kB
petite-vue-i18n.esm-browser.prod.js	36.98 kB	11.34 kB	10.17 kB
petite-vue-i18n.global.prod.js	29.84 kB	10.19 kB	9.20 kB
petite-vue-i18n.runtime.esm-browser.prod.js	22.55 kB	7.33 kB	6.63 kB
petite-vue-i18n.runtime.global.prod.js	16.83 kB	6.40 kB	5.80 kB
vue-i18n.esm-browser.prod.js	50.66 kB (+0.00 kB)	15.15 kB (+0.00 kB)	13.54 kB (+0.00 kB)
vue-i18n.global.prod.js	40.53 kB (+0.00 kB)	13.60 kB (+0.00 kB)	12.25 kB (+0.01 kB)
vue-i18n.runtime.esm-browser.prod.js	36.23 kB (+0.00 kB)	11.15 kB (+0.00 kB)	10.02 kB (+0.00 kB)
vue-i18n.runtime.global.prod.js	27.52 kB (+0.00 kB)	9.85 kB (+0.00 kB)	8.89 kB (+0.00 kB)

Usages

Name	Size	Gzip	Brotli
packages/size-check-core (@intlify/core)	9.22 kB	3.82 kB	3.46 kB
packages/size-check-petite-vue-i18n (petite-vue-i18n)	77.63 kB	30.24 kB	27.28 kB
packages/size-check-vue-i18n (vue-i18n)	82.83 kB	31.74 kB	28.51 kB

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commit: ffe6d51

[kazupon]

Thanks!