fix: Handle default exports correctly for moduleResolution: 'node' (#1784)

Author: amannn

packages/next-intl/config.d.ts

@@ -1,4 +1,4 @@
 // Needed for projects with `moduleResolution: 'node'`
 import config from './dist/types/config';
 
-export = config;
+export default config;

packages/next-intl/middleware.d.ts

@@ -1,4 +1,4 @@
 // Needed for projects with `moduleResolution: 'node'`
 import createMiddleware from './dist/types/middleware';
 
-export = createMiddleware;
+export default createMiddleware;

packages/next-intl/plugin.d.ts

@@ -1,4 +1,4 @@
 // Needed for projects with `moduleResolution: 'node'`
 import plugin from './dist/types/plugin';
 
-export = plugin;
+export default plugin;