Fix SSL context creation for MicroPython v1.23.0

[u1f992]

Starting with MicroPython v1.23.0, the ussl module is no longer provided and only the ssl module is available (at least on the rp2 port).

Therefore, l.235 in BlynkLib.py falls back to l.238 and AttributeError is raised.

MicroPython v1.23.0 on 2024-06-02; Raspberry Pi Pico W with RP2040

Type "help()" for more information.

>>> import ussl
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: no module named 'ussl'
>>> import ssl
>>> dir(ssl)
['__class__', '__name__', 'CERT_NONE', 'CERT_OPTIONAL', 'CERT_REQUIRED', 'MBEDTLS_VERSION', 'PROTOCOL_TLS_CLIENT', 'PROTOCOL_TLS_SERVER', 'SSLContext', '__dict__', '__file__', 'tls', 'wrap_socket', '__version__']
>>> ssl.create_default_context()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'create_default_context'

Instead of ssl.create_default_context(), we can use ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT) to avoid the problem.

[Astrophsica]

I'm +1 on this pull request. After reading the error message and researching the documentation, I realised it was replaced with ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT) . @vshymanskyy It would be great if you could merge this pull request, as a lot of people rely on this library (via YT tutorials).