Bundle .net 9.0 agent with runner

[CharliePoole]

This is a newly created pluggable agent, which we will bundle with the next release.

[CharliePoole]

This issue has been resolved in version 4.0.0-beta.1

The release is available on:
GitHub.
NuGet packages are also available NuGet.org and
Chocolatey Packages may be found at Chocolatey.org