feat(transport): Remove HttpTransport hub_cls attribute

This change is a prerequisite for #3404.

BREAKING CHANGE: Remove `sentry_sdk.transport.HttpTransport`'s `hub_cls` attribute.

Author: szokeasaurusrex

sentry_sdk/transport.py

@@ -12,7 +12,6 @@
 import urllib3
 import certifi
 
-import sentry_sdk
 from sentry_sdk.consts import EndpointType
 from sentry_sdk.utils import Dsn, logger, capture_internal_exceptions
 from sentry_sdk.worker import BackgroundWorker
@@ -231,9 +230,6 @@ def __init__(
             proxy_headers=options["proxy_headers"],
         )
 
-        # Backwards compatibility for deprecated `self.hub_class` attribute
-        self._hub_cls = sentry_sdk.Hub
-
     def record_lost_event(
         self,
         reason,  # type: str
@@ -604,30 +600,6 @@ def kill(self):
         logger.debug("Killing HTTP transport")
         self._worker.kill()
 
-    @staticmethod
-    def _warn_hub_cls():
-        # type: () -> None
-        """Convenience method to warn users about the deprecation of the `hub_cls` attribute."""
-        warnings.warn(
-            "The `hub_cls` attribute is deprecated and will be removed in a future release.",
-            DeprecationWarning,
-            stacklevel=3,
-        )
-
-    @property
-    def hub_cls(self):
-        # type: () -> type[sentry_sdk.Hub]
-        """DEPRECATED: This attribute is deprecated and will be removed in a future release."""
-        HttpTransport._warn_hub_cls()
-        return self._hub_cls
-
-    @hub_cls.setter
-    def hub_cls(self, value):
-        # type: (type[sentry_sdk.Hub]) -> None
-        """DEPRECATED: This attribute is deprecated and will be removed in a future release."""
-        HttpTransport._warn_hub_cls()
-        self._hub_cls = value
-
 
 class _FunctionTransport(Transport):
     """