chore(deps-dev): bump @vuepress/utils from 2.0.0-rc.14 to 2.0.0-rc.15

Bumps [@vuepress/utils](https://github.com/vuepress/core) from 2.0.0-rc.14 to 2.0.0-rc.15.
- [Release notes](https://github.com/vuepress/core/releases)
- [Changelog](https://github.com/vuepress/core/blob/main/CHANGELOG.md)
- [Commits](vuepress/core@v2.0.0-rc.14...v2.0.0-rc.15)

---
updated-dependencies:
- dependency-name: "@vuepress/utils"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -15,7 +15,7 @@
     "@vuepress/plugin-docsearch": "2.0.0-rc.26",
     "@vuepress/plugin-google-analytics": "2.0.0-rc.21",
     "@vuepress/plugin-register-components": "2.0.0-rc.21",
-    "@vuepress/utils": "2.0.0-rc.14",
+    "@vuepress/utils": "2.0.0-rc.15",
     "mathjax-full": "^3.2.2",
     "mermaid": "^10.9.1",
     "vue": "^3.4.37",