fix: src/TestSite.10/TestSite.10.csproj to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DOTNET-SYSTEMSECURITYCRYPTOGRAPHYPKCS-5708426
- https://snyk.io/vuln/SNYK-DOTNET-UMBRACOCMS-5775820
- https://snyk.io/vuln/SNYK-DOTNET-SIXLABORSIMAGESHARP-6394504
- https://snyk.io/vuln/SNYK-DOTNET-UMBRACOCMSCORE-6968881
- https://snyk.io/vuln/SNYK-DOTNET-UMBRACOCMS-6124616
- https://snyk.io/vuln/SNYK-DOTNET-UMBRACOCMS-6124620
- https://snyk.io/vuln/SNYK-DOTNET-UMBRACOCMS-6124631
- https://snyk.io/vuln/SNYK-DOTNET-UMBRACOCMSINFRASTRUCTURE-6474570

src/TestSite.10/TestSite.10.csproj

@@ -7,7 +7,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Umbraco.Cms" Version="10.4.0"/>
+        <PackageReference Include="Umbraco.Cms" Version="10.8.5"/>
         <PackageReference Include="uSync" Version="10.7.1"/>
     </ItemGroup>