Update README.md

Author: glahaye

README.md

@@ -22,7 +22,7 @@ To deploy the sample to Azure, please view [Deploying Chat Copilot](./scripts/de
 
 You will need the following items to run the sample:
 
-- [.NET 7.0 SDK](https://dotnet.microsoft.com/download/dotnet/7.0) _(via Setup install.\* script)_
+- [.NET 8.0 SDK](https://dotnet.microsoft.com/download/dotnet/8.0) _(via Setup install.\* script)_
 - [Node.js](https://nodejs.org/en/download) _(via Setup install.\* script)_
 - [Yarn](https://classic.yarnpkg.com/docs/install) _(via Setup install.\* script)_
 - [Git](https://www.git-scm.com/downloads)