Update dependency vitepress to v1.6.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
vitepress (source)	1.5.0 -> 1.6.3

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Release Notes

vuejs/vitepress (vitepress)

v1.6.3

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Bug Fixes

• docsearch not rendering properly (3e4120e)

v1.6.2

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Bug Fixes

• fix static content removal for lean chunks due to Vue 3.5 changes (#​4508) (8214cae)

v1.6.1

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Bug Fixes

• build: escape $ in replace pattern in dynamic routes plugin (e812916), closes #​4499
• theme/regression: broken hero heading at certain viewports (37dbe89)

v1.6.0

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Bug Fixes

• build: out of order css in prod builds (241d17d), closes #​4098
• build: properly strip vpi-social css declaration in debug mode (c61182a)
• build: respect vite.clearScreen in build (8ea776a), closes #​4468
• build: specify mode for iconify (8a5e8ea)
• theme: apply externalLinkIcon option on VPHome (#​4492) (fe48943)
• theme: don't show external link icon for images (096bba1)
• theme: ignore footnote-ref for outline (1832617), closes #​4402
• theme: includes text to h1 tag for hero page (#​4472) (bd896c6), closes #​4453

Features

• build: export normalize function from shared chunk (616f63f), closes #​4401
• theme: allow customizing skip to content label (ff254dc), closes #​4288
• theme: export VPNavBarSearch (23522ab), closes #​4476
• theme: export VPFeatures (#​4356) (6442e17)

Miscellaneous

• build: shiki transformers now use v3 matching algorithm (373f9b9)

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