Bump smart_date dependency to optionally 4.0

composer.json

@@ -74,7 +74,7 @@
         "drupal/security_review": "1.x-dev",
         "drupal/simple_sitemap": "^4.1",
         "drupal/sitemap": "^2.0",
-        "drupal/smart_date": "^3.1",
+        "drupal/smart_date": "^3.1||^4.0",
         "drupal/smtp": "^1.0",
         "drupal/stage_file_proxy": "^1.1||^2.0",
         "drupal/subpathauto": "^1.1",