Update dependency @types/markdown-it to v13 (#60)

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

package.json

@@ -57,7 +57,7 @@
     "@ota-meshi/eslint-plugin": "^0.15.0",
     "@types/chai": "^4.2.22",
     "@types/escape-html": "^1.0.1",
-    "@types/markdown-it": "^12.2.3",
+    "@types/markdown-it": "^13.0.0",
     "@types/mocha": "^10.0.0",
     "@types/node": "^18.0.0",
     "@types/prismjs": "^1.16.6",