gRPC Get Started: Update code sample to .NET 9

[wadepickett]

Description

This topic has high traffic and is on the to do list for the freshness effort.

The app sample needs to be updated to .NET 9. Also, while there, review and delete unused using statements in version 8 in Program.cs.
These two were pointed out in issue 32987 for example:
using System.Threading.Tasks

Remove the VS for Mac tab content.

Make sure the freshness spreadsheet is updated afterwards as well.

Page URL

https://learn.microsoft.com/en-us/aspnet/core/tutorials/grpc/grpc-start?view=aspnetcore-9.0&tabs=visual-studio

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/tutorials/grpc/grpc-start.md

Document ID

b96be346-958a-cfcd-d80a-c352d64223e8

Article author

@JamesNK

Metadata

• ID: 1d298a6c-8ddc-dbc8-d219-0fa7138442c2
• Service: aspnet-core
• Sub-service: tutorials

Related Issues

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Associated WorkItem - 367793

[timdeschryver]

@wadepickett if you want I can help with upgrading this document and the code to .NET 9

[wadepickett]

@timdeschryver, sure! I wasn't planning on hitting this one until 5 weeks from now since I have other issues I need to take care of first. You are very welcome to get it going. Thanks!