chore(deps): update dependency github-markdown-css to v5.6.0 (#823)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -117,7 +117,7 @@
         "eslint-plugin-unicorn": "51.0.1",
         "eslint-plugin-vitest": "0.4.1",
         "eslint-plugin-vitest-globals": "1.5.0",
-        "github-markdown-css": "5.5.1",
+        "github-markdown-css": "5.6.0",
         "husky": "9.0.11",
         "ignore-sync": "7.0.1",
         "is-ci": "3.0.1",