chore(deps-dev): Bump @vuepress/theme-default from 2.0.0-rc.60 to 2.0.0-rc.61 in /docs in the vuepress group

chore(deps-dev): Bump @vuepress/theme-default from 2.0.0-rc.60 to 2.0.0-rc.61 in /docs in the vuepress group #944