Deps: Update dependency next-seo to v6.

Author: renovate[bot]

package-lock.json

@@ -23,7 +23,7 @@
         "mongoose": "5.13.20",
         "new-github-issue-url": "0.2.1",
         "next": "12.3.4",
-        "next-seo": "4.29.0",
+        "next-seo": "6.1.0",
         "nprogress": "0.2.0",
         "react": "17.0.2",
         "react-dom": "17.0.2",