Update browser releases (#27211)

Author: mdn-bot

browsers/edge.json

@@ -472,6 +472,7 @@
         },
         "139": {
           "release_date": "2025-08-07",
+          "release_notes": "https://learn.microsoft.com/en-us/microsoft-edge/web-platform/release-notes/139",
           "status": "beta",
           "engine": "Blink",
           "engine_version": "139"