Update actors-quickstart.md (#4601)

Update to .NET 8 runtime

Signed-off-by: Alice Gibbons <[email protected]>
Signed-off-by: Nemanja Malocic <[email protected]>

Author: alicejgibbons

daprdocs/content/en/getting-started/quickstarts/actors-quickstart.md

@@ -33,7 +33,7 @@ For this example, you will need:
 <!-- IGNORE_LINKS -->
 - [Docker Desktop](https://www.docker.com/products/docker-desktop)
 <!-- END_IGNORE -->
-- [.NET 6](https://dotnet.microsoft.com/download/dotnet/6.0), [.NET 8](https://dotnet.microsoft.com/download/dotnet/8.0) or [.NET 9](https://dotnet.microsoft.com/download/dotnet/9.0) installed
+- [.NET 8](https://dotnet.microsoft.com/download/dotnet/8.0) installed
 
 **NOTE:** .NET 6 is the minimally supported version of .NET for the Dapr .NET SDK packages in this release. Only .NET 8 and .NET 9
 will be supported in Dapr v1.16 and later releases.