revert type hints in SessionManager

Author: sfc-gh-mmishchenko

src/snowflake/connector/session_manager.py

@@ -7,7 +7,7 @@
 import itertools
 import logging
 from dataclasses import dataclass, field, replace
-from typing import Any, Callable, Generator, Mapping
+from typing import TYPE_CHECKING, Any, Callable, Generator, Mapping
 
 from .compat import urlparse
 from .proxy import get_proxy_url
@@ -20,6 +20,9 @@
 from .vendored.urllib3.poolmanager import ProxyManager
 from .vendored.urllib3.util.url import parse_url
 
+if TYPE_CHECKING:
+    from .vendored.urllib3.connectionpool import HTTPConnectionPool, HTTPSConnectionPool
+
 logger = logging.getLogger(__name__)
 REQUESTS_RETRY = 1  # requests library builtin retry
 
@@ -56,7 +59,9 @@ def wrapper(self, *args, **kwargs):
 class ProxySupportAdapter(HTTPAdapter):
     """This Adapter creates proper headers for Proxy CONNECT messages."""
 
-    def get_connection_with_tls_context(self, request, verify, proxies=None, cert=None):
+    def get_connection_with_tls_context(
+        self, request, verify, proxies=None, cert=None
+    ) -> HTTPConnectionPool | HTTPSConnectionPool:
         proxy = select_proxy(request.url, proxies)
         try:
             host_params, pool_kwargs = self.build_connection_pool_key_attributes(