chore: bump up react-i18next version to v14 (#5375)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [react-i18next](https://togithub.com/i18next/react-i18next) | [`^13.3.0` -> `^14.0.0`](https://renovatebot.com/diffs/npm/react-i18next/13.5.0/14.0.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/react-i18next/14.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/react-i18next/14.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/react-i18next/13.5.0/14.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/react-i18next/13.5.0/14.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>i18next/react-i18next (react-i18next)</summary>

### [`v14.0.0`](https://togithub.com/i18next/react-i18next/blob/HEAD/CHANGELOG.md#1400)

[Compare Source](https://togithub.com/i18next/react-i18next/compare/v13.5.0...v14.0.0)

-   types: reportNamespaces is now optional, should fix [1693](https://togithub.com/i18next/react-i18next/issues/1693)

</details>

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packages/frontend/i18n/package.json

@@ -28,7 +28,7 @@
   },
   "dependencies": {
     "i18next": "^23.5.1",
-    "react-i18next": "^13.3.0"
+    "react-i18next": "^14.0.0"
   },
   "devDependencies": {
     "@types/prettier": "^3.0.0",

packages/frontend/i18n/src/index.ts

@@ -68,7 +68,6 @@ const standardizeLocale = (language: string) => {
 };
 
 export const createI18n = (): I18nextProviderProps['i18n'] => {
-  // @ts-expect-error ts bug
   const i18n: I18nextProviderProps['i18n'] = i18next.createInstance();
   i18n
     .use(initReactI18next)