chore(deps): update dependency serilog.extensions.hosting to v9

Author: renovate[bot]

Doppler.Extensions/Doppler.Extensions.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
-    <PackageReference Include="Serilog.Extensions.Hosting" Version="8.0.0" />
+    <PackageReference Include="Serilog.Extensions.Hosting" Version="9.0.0" />
     <PackageReference Include="Serilog.Settings.Configuration" Version="8.0.0" />
     <PackageReference Include="Serilog.Sinks.Console" Version="5.0.1" />
     <PackageReference Include="Serilog.Sinks.Loggly" Version="5.4.0" />