Bump Microsoft.Extensions.ServiceDiscovery from 8.2.0 to 8.2.1 in /docs/database/snippets/cosmos-db/AspireApp.ServiceDefaults in the dotnet group

Bump Microsoft.Extensions.ServiceDiscovery from 8.2.0 to 8.2.1 in /docs/database/snippets/cosmos-db/AspireApp.ServiceDefaults in the dotnet group #2349