chore(deps): bump i18next from 26.6.0 to 26.7.1 in /frontend

Bumps [i18next](https://github.com/i18next/i18next) from 26.6.0 to 26.7.1.
- [Release notes](https://github.com/i18next/i18next/releases)
- [Changelog](https://github.com/i18next/i18next/blob/master/CHANGELOG.md)
- [Commits](https://github.com/i18next/i18next/compare/v26.6.0...v26.7.1)

---
updated-dependencies:
- dependency-name: i18next
  dependency-version: 26.7.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -45,7 +45,7 @@
     "antd": "^6.6.8",
     "codemirror": "^6.0.2",
     "dayjs": "^1.11.23",
-    "i18next": "^26.6.0",
+    "i18next": "^26.7.1",
     "otpauth": "^9.5.2",
     "persian-calendar-suite": "^1.5.6",
     "react": "^19.3.1",