Sentinel connection proxy master variable incorrect

[mayank-apnamart]

Version: 5.0.3

Platform: Python 3.11 on Azure

Description: The SentinelConnectionProxy is_master variable is initialized incorrectly to '0' rather than boolean, hence does not use slaves

``
class SentinelConnectionPool(ConnectionPool):
"""
Sentinel backed connection pool.

If ``check_connection`` flag is set to True, SentinelManagedConnection
sends a PING command right after establishing the connection.
"""

def __init__(self, service_name, sentinel_manager, **kwargs):
    kwargs["connection_class"] = kwargs.get(
        "connection_class",
        SentinelManagedSSLConnection
        if kwargs.pop("ssl", False)
        else SentinelManagedConnection,
    )
    self.is_master = kwargs.pop("is_master", True)
    self.check_connection = kwargs.pop("check_connection", False)
    self.proxy = SentinelConnectionPoolProxy(
        connection_pool=self,
        is_master=self.is_master,
        check_connection=self.check_connection,
        service_name=service_name,
        sentinel_manager=sentinel_manager,
    )
    super().__init__(**kwargs)
    self.connection_kwargs["connection_pool"] = self.proxy
    self.service_name = service_name
    self.sentinel_manager = sentinel_manager

``

Here is_master pops to 0