chore: Bump the nuget group with 1 update

Bumps Umbraco.Cms from 15.0.0 to 15.4.2

---
updated-dependencies:
- dependency-name: Umbraco.Cms
  dependency-version: 15.4.2
  dependency-type: direct:production
  dependency-group: nuget
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/UmbracoWeb/UmbracoWeb/UmbracoWeb.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Umbraco.Cms" Version="15.0.0" />
+    <PackageReference Include="Umbraco.Cms" Version="15.4.2" />
     <PackageReference Include="Microsoft.Data.SqlClient" Version="5.2.2" />
     <PackageReference Include="Serilog.Extensions.Logging" Version="8.0.0" />
     <PackageReference Include="Serilog.Sinks.File" Version="6.0.0" />