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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-8187303
- https://snyk.io/vuln/SNYK-JS-NEXT-8186172

package.json

@@ -38,7 +38,7 @@
     "globby": "^11.1.0",
     "htmr": "^1.0.1",
     "itemsjs": "^2.1.13",
-    "next": "11.1.4",
+    "next": "14.2.7",
     "next-pwa": "^5.4.7",
     "next-seo": "^4.29.0",
     "nprogress": "^0.2.0",