examples/network: Use SSLContext instead of old ssl.wrap_socket.

`ssl.wrap_socket()` is deprecated in CPython, so use `SSLContext` instead,
so the example is a good example to copy.

Signed-off-by: Damien George <damien@micropython.org>

examples/network/https_client.py

@@ -32,7 +32,10 @@ def main(domain, addr_family=0, use_stream=True):
     s.connect(addr)
 
     # Upgrade the socket to a TLS connection.
-    s = ssl.wrap_socket(s)
+    ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+    ctx.check_hostname = False
+    ctx.verify_mode = ssl.CERT_NONE
+    s = ctx.wrap_socket(s)
     print(s)
 
     # Send request and read response.