meta: bump classnames from 2.3.2 to 2.5.1

Bumps [classnames](https://github.com/JedWatson/classnames) from 2.3.2 to 2.5.1.
- [Changelog](https://github.com/JedWatson/classnames/blob/main/HISTORY.md)
- [Commits](JedWatson/classnames@v2.3.2...v2.5.1)

---
updated-dependencies:
- dependency-name: classnames
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -54,7 +54,7 @@
     "@vcarl/remark-headings": "~0.1.0",
     "@vercel/analytics": "~1.1.1",
     "autoprefixer": "~10.4.16",
-    "classnames": "~2.3.2",
+    "classnames": "~2.5.1",
     "cross-env": "7.0.3",
     "feed": "~4.2.2",
     "github-slugger": "~2.0.0",