Fix NuGet Security Vulnerability

Author: TheCodeTraveler

src/CommunityToolkit.Maui.UnitTests/CommunityToolkit.Maui.UnitTests.csproj

@@ -21,6 +21,7 @@
   <ItemGroup>
     <!--Fix vulnerabilities-->
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
+    <PackageReference Include="System.Private.Uri" Version="4.3.2" />
     <PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
   </ItemGroup>