Bump Microsoft.Extensions.Hosting from 8.0.1 to 9.0.1 in /docs/core/extensions/snippets/workers/timer-service in the dotnet group across 1 directory

Bump Microsoft.Extensions.Hosting from 8.0.1 to 9.0.1 in /docs/core/extensions/snippets/workers/timer-service in the dotnet group across 1 directory #4445