chore(deps): update dependency @vuepress/plugin-blog to v1.9.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@vuepress/plugin-blog	1.9.2 -> 1.9.4

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Release Notes

ulivz/vuepress-plugin-blog

### [`v1.9.4`](https://togithub.com/ulivz/vuepress-plugin-blog/blob/master/CHANGELOG.md#​194-httpsgithubcomulivzvuepress-plugin-blogcomparev193v194-2021-01-17) [Compare Source](https://togithub.com/ulivz/vuepress-plugin-blog/compare/v1.9.3...v1.9.4) ##### Bug Fixes - error when requiring dayjs ([#​94](https://togithub.com/ulivz/vuepress-plugin-blog/issues/94)) ([52aa5ed](https://togithub.com/ulivz/vuepress-plugin-blog/commit/52aa5edebde8190035bdc85cfe43ad3978e60ceb)) ### [`v1.9.3`](https://togithub.com/ulivz/vuepress-plugin-blog/blob/master/CHANGELOG.md#​193-httpsgithubcomulivzvuepress-plugin-blogcomparev192v193-2020-11-01) [Compare Source](https://togithub.com/ulivz/vuepress-plugin-blog/compare/v1.9.2...v1.9.3) ##### Bug Fixes - pagination filter is incorrect when frontmatter key is number ([4abe10c](https://togithub.com/ulivz/vuepress-plugin-blog/commit/4abe10c8faf519e9aa682aae00ea80e1b4ec4185))

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