chore(deps): bump react-i18next in /app/gui in the bun group

Bumps the bun group in /app/gui with 1 update: [react-i18next](https://github.com/i18next/react-i18next).


Updates `react-i18next` from 15.7.4 to 16.0.0
- [Changelog](https://github.com/i18next/react-i18next/blob/master/CHANGELOG.md)
- [Commits](i18next/react-i18next@v15.7.4...v16.0.0)

---
updated-dependencies:
- dependency-name: react-i18next
  dependency-version: 16.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: bun
...

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

Author: dependabot[bot]

app/gui/package.json

@@ -24,7 +24,7 @@
     "i18next-http-backend": "^3.0.1",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
-    "react-i18next": "^15.0.2",
+    "react-i18next": "^16.0.0",
     "react-minimal-pie-chart": "^9.0.0",
     "react-router-dom": "^7.0.1",
     "xstate": "^5.3.0"