chore(deps-dev): bump mdast-util-to-string from 3.1.0 to 3.1.1 (#3018)

Bumps [mdast-util-to-string](https://github.com/syntax-tree/mdast-util-to-string) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/syntax-tree/mdast-util-to-string/releases)
- [Commits](syntax-tree/mdast-util-to-string@3.1.0...3.1.1)

---
updated-dependencies:
- dependency-name: mdast-util-to-string
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -217,7 +217,7 @@
     "mdast-util-from-markdown": "1.2.0",
     "mdast-util-frontmatter": "1.0.1",
     "mdast-util-mdx": "2.0.1",
-    "mdast-util-to-string": "3.1.0",
+    "mdast-util-to-string": "3.1.1",
     "micromark-extension-frontmatter": "1.0.0",
     "micromark-extension-mdxjs": "1.0.0",
     "prettier": "2.8.1",