Recover version.json to main/26-dev

version.json

diff --git a/version.json b/version.json
index 9deb430..469c990 100644
--- a/version.json
+++ b/version.json
@@ -1,17 +1,17 @@
 {
-  "25.x": {
-    "protoc_version": "25.0-dev",
-    "lts": false,
-    "date": "2023-11-01",
-    "languages": {
-      "cpp": "4.25.0-dev",
-      "csharp": "3.25.0-dev",
-      "java": "3.25.0-dev",
-      "javascript": "3.25.0-dev",
-      "objectivec": "3.25.0-dev",
-      "php": "3.25.0-dev",
-      "python": "4.25.0-dev",
-      "ruby": "3.25.0-dev"
+    "main": {
+        "protoc_version": "26-dev",
+        "lts": false,
+        "date": "2023-10-16",
+        "languages": {
+            "cpp": "4.26-dev",
+            "csharp": "3.26-dev",
+            "java": "3.26-dev",
+            "javascript": "3.26-dev",
+            "objectivec": "3.26-dev",
+            "php": "3.26-dev",
+            "python": "4.26-dev",
+            "ruby": "3.26-dev"
+        }
     }
-  }
 }