Add Windows Server 2022 images for 3.9 and 3.10-rc

[TBBle]

Tested on a Windows Server 2022 evaluation install in a Hyper-V VM, using Mirantis Container Runtime 20.10.6 from DockerMsftProvider.

Basic tests for functionality, for both new Dockerfiles, downloaded into otherwise-empty directories:

PS C:\Users\Administrator\3.9> docker build . -t py39
Sending build context to Docker daemon  4.608kB
Step 1/11 : FROM mcr.microsoft.com/windows/servercore:ltsc2022
...
Successfully tagged py39:latest
PS C:\Users\Administrator\3.9> docker run py39 python -c "import platform; print(platform.win32_ver()); import sys; print(sys.version)"
('10', '10.0.20348', 'SP0', 'Multiprocessor Free')
3.9.6 (tags/v3.9.6:db3ff76, Jun 28 2021, 15:26:21) [MSC v.1929 64 bit (AMD64)]

PS C:\Users\Administrator\3.10-rc> docker build . -t py310rc
Sending build context to Docker daemon  4.608kB
Step 1/11 : FROM mcr.microsoft.com/windows/servercore:ltsc2022
...
Successfully tagged py310rc:latest
PS C:\Users\Administrator\3.10-rc> docker run py310rc python -c "import platform; print(platform.win32_ver()); import sys; print(sys.version)"
('10', '10.0.20348', 'SP0', 'Multiprocessor Free')
3.10.0rc1 (tags/v3.10.0rc1:cc115e5, Aug  3 2021, 15:22:01) [MSC v.1929 64 bit (AMD64)]

• Test the images (either CI-generated, or just run the Dockerfiles locally)
• Internal sign-off per Wargaming.net Open Source contribution policy (2/2 done)

[TBBle]

CI has previously passed for Windows Server 2022, but rebasing to pull bb70f32 has put it back into the workflow-approval queue.

[tianon]

Looks good, thanks!