feat: upgrade i18next from 22.5.1 to 23.5.1

Snyk has created this PR to upgrade i18next from 22.5.1 to 23.5.1.

See this package in npm:
https://www.npmjs.com/package/i18next

See this project in Snyk:
https://app.snyk.io/org/gluu-gca/project/9a1b2f96-22f2-4325-bf59-06e117632057?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

admin-ui/package.json

@@ -120,7 +120,7 @@
     "formik": "^2.2.9",
     "fs-extra": "^11.1.1",
     "holderjs": "^2.9.9",
-    "i18next": "^22.4.14",
+    "i18next": "^23.5.1",
     "i18next-browser-languagedetector": "^7.0.1",
     "i18next-fetch-backend": "^5.0.2",
     "isomorphic-fetch": "^3.0.0",