Remove Windows 21H1
What does this MR do?
Removes Windows 21H1.
Why was this MR needed?
This build is end of life.
What's the best way to test this MR?
Pipeline should pass.
What are the relevant issue numbers?
Closes #30924 (closed)
Removes Windows 21H1.
This build is end of life.
Pipeline should pass.
Closes #30924 (closed)