Dropped SSL Support for redis connection

[nicolas-chaulet]

I think that the changes introduced here https://github.com/samuelcolvin/arq/pull/259 somehow broke the support for a complex ssl configuartion, now the __init__ method from redis requires a boolean as opposed to a boolean or an SSLContext object like it used to. For example that setup does not work anymore:

    ctx = ssl.SSLContext()
    ctx.check_hostname = False
    ctx.verify_mode = ssl.CERT_NONE
    return RedisSettings(
        host=settings.REDIS_HOST,
        port=settings.REDIS_PORT,
        password=settings.REDIS_PASSWORD,
        ssl=ctx,
        conn_timeout=10,
    )

Here is an extract of what the Redis client init method expects:

    def __init__(
        self,
        *,
        ....
        ssl: bool = False,
        ssl_keyfile: Optional[str] = None,
        ssl_certfile: Optional[str] = None,
        ssl_cert_reqs: str = "required",
        ssl_ca_certs: Optional[str] = None,
        ssl_ca_data: Optional[str] = None,
        ssl_check_hostname: bool = False,
        max_connections: Optional[int] = None,
      ...
    ):