build(deps-dev): bump github-markdown-css from 5.5.1 to 5.6.1

Bumps [github-markdown-css](https://github.com/sindresorhus/github-markdown-css) from 5.5.1 to 5.6.1.
- [Release notes](https://github.com/sindresorhus/github-markdown-css/releases)
- [Commits](sindresorhus/github-markdown-css@v5.5.1...v5.6.1)

---
updated-dependencies:
- dependency-name: github-markdown-css
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -95,7 +95,7 @@
     "eslint-plugin-local-rules": "2.0.1",
     "eslint-plugin-storybook": "0.6.15",
     "eslint-plugin-wc": "2.0.4",
-    "github-markdown-css": "5.5.1",
+    "github-markdown-css": "5.6.1",
     "glob": "8.1.0",
     "husky": "8.0.3",
     "lint-staged": "15.2.2",