fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-SEMVER-3247795

package.json

@@ -148,7 +148,7 @@
     "remark-lint": "^8.0.0",
     "remark-lint-list-item-indent": "^2.0.1",
     "remark-preset-lint-recommended": "^5.0.0",
-    "superagent": "^7.1.1",
+    "superagent": "^9.0.0",
     "ts-node": "^10.8.1",
     "typedoc": "^0.22.11",
     "typescript": "^4.3.5",