build(deps): bump Microsoft.WindowsAppSDK in /src

Bumps [Microsoft.WindowsAppSDK](https://github.com/microsoft/windowsappsdk) from 1.3.230602002 to 1.3.230724000.
- [Release notes](https://github.com/microsoft/windowsappsdk/releases)
- [Commits](https://github.com/microsoft/windowsappsdk/commits)

---
updated-dependencies:
- dependency-name: Microsoft.WindowsAppSDK
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

src/ReactiveUI.WinUI/ReactiveUI.WinUI.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>net6.0-windows10.0.17763.0;net7.0-windows10.0.17763.0</TargetFrameworks>
     <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.3.230602002" />
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.3.230724000" />
   </ItemGroup>
 
   <ItemGroup>