feat: Update package.json to 7.0.4

Commit by [GitHub Actions](https://github.com/Cysharp/MagicOnion/actions/runs/14769322284)

Author: github-actions[bot]

Directory.Build.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <VersionPrefix>7.0.3</VersionPrefix>
+    <VersionPrefix>7.0.4</VersionPrefix>
   </PropertyGroup>
 
   <PropertyGroup>

src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion.Client.Unity/package.json

@@ -2,7 +2,7 @@
     "name": "com.cysharp.magiconion.client.unity",
     "displayName": "MagicOnion.Client.Unity",
     "author": { "name": "Cysharp, Inc.", "url": "https://cysharp.co.jp/en/" },
-    "version": "7.0.3",
+    "version": "7.0.4",
     "unity": "2021.3",
     "description": "Unified Realtime/API framework for .NET platform and Unity.",
     "keywords": [