wasm: qtwasmserver.py does not work with python 3.12

when running qtwasmserver.py on Ubuntu, which uses python3.12:

Traceback (most recent call last):
  File "/home/lpotter/bin/qtwasmserver.py", line 124, in <module>
    main()
  File "/home/lpotter/bin/qtwasmserver.py", line 120, in main
    serve_on_thread(address, https_port, True)
  File "/home/lpotter/bin/qtwasmserver.py", line 102, in serve_on_thread
    httpd.socket = ssl.wrap_socket(
                   ^^^^^^^^^^^^^^^
AttributeError: module 'ssl' has no attribute 'wrap_socket'

https://docs.python.org/3.12/whatsnew/3.12.html#ssl

ssl.wrap_socket has been removed. need to use SSLContext() wrap_socket instead