chore(deps): update dependency vue-router to v4.0.15

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
vue-router	4.0.14 -> 4.0.15

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Release Notes

vuejs/router

v4.0.15

Compare Source

Bug Fixes

• matcher: keep trailing slash on empty optional params (2f1e9b9), closes #​1357
• setup history listeners once (faa8562), closes #​1344
• view: handle @​vue/compat automatically (92becf6), closes #​1315

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