chore(deps): update dependency vuepress to v1.5.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
vuepress	devDependencies	patch	1.5.2 -> 1.5.4

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Release Notes

vuejs/vuepress

v1.5.4

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Bug Fixes

• $core: decode regularPath when generate router config (fix #​1946) (#​1947) (dd26c7c)
• $shared-utils: fix date parse logic for permalinks (#​2181) (d4d0380)
• $shared-utils: replace diacritics with regex (#​1855) (a03e93d)
• $theme-default: overlap navbar dropdown menus (fix #​2227) (#​2365) (ceb0fa9)
• $theme-default: remove invalidate aria-labelledby on homepage title(#​2277) (94a7de4)

v1.5.3

Compare Source

Bug Fixes

• $theme-default: fix editLink for repos hosted on gitlab.com (#​2523) (1c3967c)
• add toml dependencyt to shared-utils (b858a6e)
• regular files should not be executable (#​2535) (ffb8527)
• $theme-default: improve last-updated text color contrast (#​2282) (7ca9fbc)
• allows no rel attribute on external links in the nav (#​2338) (b343cd3)
• $core: style loss under build for package that specifies sideEffects: false (fix #​2350) (#​2471) (7e29900)
• $markdown: line highlighting not working correctly when importing code snippets (#​2441) (d0f2e42)

Features

• $theme-default: add initial open group index option (#​2408) (465ae40)

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