chore(deps-dev): bump micromark-extension-frontmatter (#3500)

Bumps [micromark-extension-frontmatter](https://github.com/micromark/micromark-extension-frontmatter) from 1.0.0 to 2.0.0.
- [Release notes](https://github.com/micromark/micromark-extension-frontmatter/releases)
- [Commits](micromark/micromark-extension-frontmatter@1.0.0...2.0.0)

---
updated-dependencies:
- dependency-name: micromark-extension-frontmatter
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -228,7 +228,7 @@
     "mdast-util-frontmatter": "1.0.1",
     "mdast-util-mdx": "2.0.1",
     "mdast-util-to-string": "3.1.1",
-    "micromark-extension-frontmatter": "1.0.0",
+    "micromark-extension-frontmatter": "2.0.0",
     "micromark-extension-mdxjs": "1.0.1",
     "postcss-custom-properties-fallback": "^1.0.2",
     "prettier": "2.8.8",