Add Rust to version.json with a major version of 4.

This is a first step towards having a Rust crate version be updated automatically with our release process.

PiperOrigin-RevId: 696151221

csharp/src/Google.Protobuf/Reflection/FeatureSetDescriptor.g.cs

@@ -1,17 +0,0 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-#endregion
-
-namespace Google.Protobuf.Reflection;
-
-internal sealed partial class FeatureSetDescriptor
-{
-    // Canonical serialized form of the edition defaults, generated by embed_edition_defaults.
-    private const string DefaultsBase64 =
-        "ChMYhAciACoMCAEQAhgCIAMoATACChMY5wciACoMCAIQARgBIAIoATABChMY6AciDAgBEAEYASACKAEwASoAIOYHKOgH";
-}

version.json

@@ -11,7 +11,8 @@
             "objectivec": "4.30-dev",
             "php": "4.30-dev",
             "python": "6.30-dev",
-            "ruby": "4.30-dev"
+            "ruby": "4.30-dev",
+            "rust": "4.30-dev"
         }
     }
 }