Bump Uno.Sdk from 5.6.0-dev.250 to 5.6.0-dev.264 in /src

Bumps [Uno.Sdk](https://github.com/unoplatform/uno.templates) from 5.6.0-dev.250 to 5.6.0-dev.264.
- [Commits](https://github.com/unoplatform/uno.templates/commits)

---
updated-dependencies:
- dependency-name: Uno.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

global.json

@@ -3,7 +3,7 @@
     "allowPrerelease": false
   },
   "msbuild-sdks": {
-    "Uno.Sdk": "5.6.0-dev.250",
+    "Uno.Sdk": "5.6.0-dev.264",
     "Microsoft.Build.NoTargets": "3.7.56"
   }
 }