build(deps): bump Microsoft.Windows.SDK.BuildTools in /src (#3512)

Bumps Microsoft.Windows.SDK.BuildTools from 10.0.22621.755 to 10.0.22621.756.

---
updated-dependencies:
- dependency-name: Microsoft.Windows.SDK.BuildTools
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/ReactiveUI.Maui/ReactiveUI.Maui.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
 		<TargetFrameworks>net6.0;net7.0</TargetFrameworks>
@@ -17,7 +17,7 @@
 
 	<ItemGroup Condition="$(TargetFramework.StartsWith('net6.0-windows10')) or $(TargetFramework.StartsWith('net7.0-windows10'))">
 		<PackageReference Include="Microsoft.WindowsAppSDK" Version="1.2.230217.4" />
-    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.755" />
+    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.756" />
   </ItemGroup>
 	<ItemGroup>
 		<ProjectReference Include="..\ReactiveUI\ReactiveUI.csproj" />