fix: system default CA certificate not being fetched

[AkMo3]

Recently during FIL Bangalore faced issue related to SSL Certificate while making API request, this PR is a fix to that.

Issue Log:

1. Command:
   $ python3 ./sdk-demos/fine-tuning.py

2. Command Log:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/aiohttp/connector.py", line 1116, in _wrap_create_connection
    return await self._loop.create_connection(*args, **kwargs, sock=sock)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/base_events.py", line 1154, in create_connection
    transport, protocol = await self._create_connection_transport(
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/base_events.py", line 1187, in _create_connection_transport
    await waiter
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/sslproto.py", line 581, in _on_handshake_complete
    raise handshake_exc
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/sslproto.py", line 563, in _do_handshake
    self._sslobj.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/ssl.py", line 916, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1000)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/akmo/GitHub/Lumino-SDK/lumino-demos/./sdk-demos/fine-tuning.py", line 33, in <module>
    asyncio.run(main())
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/runners.py", line 194, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/base_events.py", line 686, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/Users/akmo/GitHub/Lumino-SDK/lumino-demos/./sdk-demos/fine-tuning.py", line 10, in main
    job = await client.fine_tuning.create_fine_tuning_job(FineTuningJobCreate(
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/lumino/fine_tuning.py", line 43, in create_fine_tuning_job
    data = await self._sdk._request("POST", "/fine-tuning", json=job_create.dict())
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/lumino/sdk.py", line 108, in _request
    async with self.session.request(method, url, **kwargs) as response:  # type: ignore
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/aiohttp/client.py", line 1423, in __aenter__
    self._resp: _RetType = await self._coro
                           ^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/aiohttp/client.py", line 701, in _request
    conn = await self._connector.connect(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/aiohttp/connector.py", line 544, in connect
    proto = await self._create_connection(req, traces, timeout)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/aiohttp/connector.py", line 1050, in _create_connection
    _, proto = await self._create_direct_connection(req, traces, timeout)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/aiohttp/connector.py", line 1394, in _create_direct_connection
    raise last_exc
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/aiohttp/connector.py", line 1363, in _create_direct_connection
    transp, proto = await self._wrap_create_connection(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/aiohttp/connector.py", line 1118, in _wrap_create_connection
    raise ClientConnectorCertificateError(req.connection_key, exc) from exc
aiohttp.client_exceptions.ClientConnectorCertificateError: Cannot connect to host api.luminolabs.ai:443 ssl:True [SSLCertVerificationError: (1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1000)')]