Update browser releases (#27033)

Author: mdn-bot

browsers/edge.json

@@ -466,15 +466,21 @@
         "138": {
           "release_date": "2025-06-26",
           "release_notes": "https://learn.microsoft.com/en-us/microsoft-edge/web-platform/release-notes/138",
-          "status": "nightly",
+          "status": "beta",
           "engine": "Blink",
           "engine_version": "138"
         },
         "139": {
           "release_date": "2025-08-07",
-          "status": "planned",
+          "status": "nightly",
           "engine": "Blink",
           "engine_version": "139"
+        },
+        "140": {
+          "release_date": "2025-09-04",
+          "status": "planned",
+          "engine": "Blink",
+          "engine_version": "140"
         }
       }
     }