fix: src/Umbraco.Community.FileSystemProviders.B2.TestSite/Umbraco.Community.FileSystemProviders.B2.TestSite.csproj to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DOTNET-UMBRACOCMSAPIDELIVERY-11334729

Author: snyk-bot

src/Umbraco.Community.FileSystemProviders.B2.TestSite/Umbraco.Community.FileSystemProviders.B2.TestSite.csproj

@@ -6,7 +6,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Umbraco.Cms" Version="16.0.0"/>
+        <PackageReference Include="Umbraco.Cms" Version="16.1.1"/>
         <PackageReference Include="uSync" Version="16.0.0"/>
     </ItemGroup>