Fix Xamarin.Forms versions

Make everything use 4.3.0.

Needed because of https://github.com/xamarin/Xamarin.Forms/issues/8209

samples/BlazorNativeTodo/BlazorNativeTodo.csproj

@@ -1,5 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
-
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <ProduceReferenceAssembly>true</ProduceReferenceAssembly>

samples/BlazorNativeWeather/BlazorNativeWeather/BlazorNativeWeather.csproj

@@ -5,14 +5,9 @@
     <RazorLangVersion>3.0</RazorLangVersion>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
-    <DebugType>portable</DebugType>
-    <DebugSymbols>true</DebugSymbols>
-  </PropertyGroup>
-
   <ItemGroup>
-    <PackageReference Include="Xamarin.Forms" Version="4.3.0.908675" />
     <PackageReference Include="Xamarin.Essentials" Version="1.3.1" />
+    <PackageReference Include="Xamarin.Forms" Version="4.3.0.908675" />
   </ItemGroup>
 
   <ItemGroup>

src/Microsoft.Blazor.Native/Microsoft.Blazor.Native.csproj

@@ -12,7 +12,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Xamarin.Forms" Version="4.2.0.910310" />
+    <PackageReference Include="Xamarin.Forms" Version="4.3.0.908675" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="3.0.0" />
   </ItemGroup>