Bump remark-frontmatter from 3.0.0 to 5.0.0

Bumps [remark-frontmatter](https://github.com/remarkjs/remark-frontmatter) from 3.0.0 to 5.0.0.
- [Release notes](https://github.com/remarkjs/remark-frontmatter/releases)
- [Commits](remarkjs/remark-frontmatter@3.0.0...5.0.0)

---
updated-dependencies:
- dependency-name: remark-frontmatter
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -58,7 +58,7 @@
     "react-select": "^5.7.3",
     "react-smooth-collapse": "^2.1.2",
     "react-sticky-el": "^2.0.9",
-    "remark-frontmatter": "^3.0.0",
+    "remark-frontmatter": "^5.0.0",
     "remark-slug": "^6.1.0",
     "sharp": "^0.31.1",
     "theme-ui": "^0.14.7",