Update dependency vue-i18n to v8.15.4

This MR contains the following updates:

Package	Type	Update	Change	References
vue-i18n	dependencies	patch	8.15.0 -> 8.15.4	source

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Release Notes

kazupon/vue-i18n

v8.15.4

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🐛 Bug Fixes

• index: improve formatFallbackMessages code (#​779) (#​783) by @​masongzhi (53895b9))

🆙 Updates

• some fixes (8a9a950)

v8.15.3

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🐛 Bug Fixes

• index: improve formatFallbackMessages code (#​779) (#​783) by @​masongzhi (53895b9))

🆙 Updates

• some fixes (8a9a950)

v8.15.2

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⚡ Improvements

• index: fix mergeLocaleMessage. add changes notification on merging with an empty target object (#​752) by @​jekill (048eac5), closes #​752

v8.15.1

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🐛 Bug Fixes

• index: Fix exception when using unit number formatting by @​simonjodet (194b801), closes #​750 #​751

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