fix: package.json & yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AXIOS-6671926

Author: snyk-bot

package.json

@@ -27,7 +27,7 @@
     "@markdoc/markdoc": "^0.2.1",
     "@markdoc/next.js": "^0.2.1",
     "@next/bundle-analyzer": "^13.2.0",
-    "@nrwl/next": "^15.2.1",
+    "@nrwl/next": "^15.8.8",
     "@schultzp2020/prism-react-renderer": "^1.3.7",
     "@segment/analytics-next": "^1.38.0",
     "@sindresorhus/slugify": "^2.1.0",