Bump vue-router from 4.3.0 to 4.3.1 in /webapp

Bumps vue-router from 4.3.0 to 4.3.1.

Release notes

Sourced from vue-router's releases.

v4.3.1

Please refer to CHANGELOG.md for details.

Commits

• f85e5cb release: vue-router@4.3.1
• c54fc84 fix: avoid normalizing the fullPath (#2189)
• 8e5f04f docs: update aside
• 187e7d0 docs: up cert
• 7a7f8db docs: use UTF-8 box drawing characters (#2201)
• 7b6dcae docs: Update active-links.md (#2207)
• 0672d30 Update dynamic-matching.md (#2200)
• f776cbe docs: update certificate links
• 31c5936 chore: lines in comments
• 4e82939 docs: add 'Active links' (#2183)
• Additional commits viewable in compare view

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