chore(deps): bump i18next from 25.8.14 to 26.0.3 in /frontend

Bumps [i18next](https://github.com/i18next/i18next) from 25.8.14 to 26.0.3.
- [Release notes](https://github.com/i18next/i18next/releases)
- [Changelog](https://github.com/i18next/i18next/blob/master/CHANGELOG.md)
- [Commits](i18next/i18next@v25.8.14...v26.0.3)

---
updated-dependencies:
- dependency-name: i18next
  dependency-version: 26.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

frontend/package-lock.json

@@ -40,7 +40,7 @@
     "date-fns": "^4.1.0",
     "devalue": "^5.6.3",
     "dompurify": "^3.3.3",
-    "i18next": "^25.8.14",
+    "i18next": "^26.0.4",
     "i18next-browser-languagedetector": "^8.2.1",
     "imohash": "^1.0.3",
     "plyr": "^3.8.4",