⬆️ Update dependency next-i18next to v13 (#956)

* ⬆️ Update dependency next-i18next to v13

* 🚨 Fix compile errors

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Manuel <manuel.ruwe@bluewin.ch>

src/pages/login.tsx

@@ -98,7 +98,7 @@ export default function AuthenticationTitle() {
           <PasswordInput
             id="password"
             label={t('form.fields.password.label')}
-            placeholder={t('form.fields.password.placeholder')}
+            placeholder={t('form.fields.password.placeholder') ?? undefined}
             required
             autoFocus
             mt="md"