fix: src/TestSite.13/TestSite.13.csproj to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DOTNET-BOUNCYCASTLECRYPTOGRAPHY-7831268
- https://snyk.io/vuln/SNYK-DOTNET-SIXLABORSIMAGESHARP-7547406
- https://snyk.io/vuln/SNYK-DOTNET-BOUNCYCASTLECRYPTOGRAPHY-7831266
- https://snyk.io/vuln/SNYK-DOTNET-SIXLABORSIMAGESHARP-7547407
- https://snyk.io/vuln/SNYK-DOTNET-AZUREIDENTITY-6597976
- https://snyk.io/vuln/SNYK-DOTNET-AZUREIDENTITY-7246762
- https://snyk.io/vuln/SNYK-DOTNET-UMBRACOCMSCORE-6941410
- https://snyk.io/vuln/SNYK-DOTNET-UMBRACOCMSWEBBACKOFFICE-6941411
- https://snyk.io/vuln/SNYK-DOTNET-BOUNCYCASTLECRYPTOGRAPHY-7577211
- https://snyk.io/vuln/SNYK-DOTNET-SIXLABORSIMAGESHARP-6615678
- https://snyk.io/vuln/SNYK-DOTNET-SIXLABORSIMAGESHARP-6615679

src/TestSite.13/TestSite.13.csproj

@@ -7,7 +7,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Umbraco.Cms" Version="13.3.0"/>
+        <PackageReference Include="Umbraco.Cms" Version="14.0.0"/>
         <PackageReference Include="uSync" Version="13.1.3"/>
     </ItemGroup>