Update browser releases (#28268)

Author: mdn-bot

browsers/bun.json

@@ -734,6 +734,13 @@
         "1.3.0": {
           "release_date": "2025-10-10",
           "release_notes": "https://bun.com/blog/release-notes/bun-v1.3.0",
+          "status": "retired",
+          "engine": "WebKit",
+          "engine_version": "623.1.7"
+        },
+        "1.3.1": {
+          "release_date": "2025-10-22",
+          "release_notes": "https://bun.com/blog/release-notes/bun-v1.3.1",
           "status": "current",
           "engine": "WebKit",
           "engine_version": "623.1.7"