feat!: Require locale to be returned from getRequestConfig

[amannn]

This was deprecated in #1485 and is now required.

This change is only relevant to you if you're using a setup with i18n routing:

// request.ts

import {getRequestConfig} from 'next-intl/server';
import {hasLocale} from 'next-intl';
import {routing} from './routing';
 
export default getRequestConfig(async ({requestLocale}) => {
  // Typically corresponds to the `[locale]` segment
  const requested = await requestLocale;
  const locale = hasLocale(routing.locales, requested)
    ? requested
    : routing.defaultLocale;
 
  return {
    locale, // ← This is mandatory
    messages: (await import(`../../messages/${locale}.json`)).default
  };
});

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