Update dependency vuepress to v1.2.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
vuepress	devDependencies	minor	1.1.0 -> 1.2.0

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Release Notes

vuejs/vuepress

v1.2.0

Compare Source

Bug Fixes

• $core: optimize error log (close: #​1296) (#​1413) (51de6cf)
• $markdown: notify error when not found snippet (close: #​1872) (#​1910) (6aaa7d7)
• $theme-default: regression of arrow spacing consistent (close: #​1427) (#​1907) (dbda574)
• $theme-default: make dropdown-title's UI consistent with nav-link (#​1890) (757e880)
• $theme-default: make navbar dropdown links accessible (#​1837) (a8ce645)
• $theme-default: regression of custom container default title (#​1875) (e0ef407)

Features

• $core: config "pattern" of resolved files (close: #​1700)(#​1705) (1f3e4e2)
• $core: support async function exported in vuepress config (close: #​1185) (#​1925) (cdbfd75)
• $core: Upgrade vue version to 2.6.10 (#​1876) (c17c70e)
• $theme-default: smooth scroll (close #​567) (#​1881) (2e3efb4)
• $theme-default:: enable editLink on specific page via frontmatter (close: #​1762) (#​1825) (0e8a442)
• $markdown: Highlight kotlin code on snippets import (close: #​1831)(#​1874) (f913fea)
• $shared-utils: resolve regularPath when getting permalink (#​1786) (c6ce6cf)

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