Remove BaseAdapter from requests.sessions (#6264)

Author: KotlinIsland

stubs/requests/requests/sessions.pyi

@@ -5,7 +5,7 @@ from . import adapters, auth as _auth, compat, cookies, exceptions, hooks, model
 from .models import Response
 from .packages.urllib3 import _collections
 
-BaseAdapter = adapters.BaseAdapter
+_BaseAdapter = adapters.BaseAdapter
 OrderedDict = compat.OrderedDict
 cookiejar_from_dict = cookies.cookiejar_from_dict
 extract_cookies_to_jar = cookies.extract_cookies_to_jar
@@ -230,8 +230,8 @@ class Session(SessionRedirectMixin):
     ) -> Response: ...
     def send(self, request: PreparedRequest, **kwargs) -> Response: ...
     def merge_environment_settings(self, url, proxies, stream, verify, cert): ...
-    def get_adapter(self, url: str) -> BaseAdapter: ...
+    def get_adapter(self, url: str) -> _BaseAdapter: ...
     def close(self) -> None: ...
-    def mount(self, prefix: Text | bytes, adapter: BaseAdapter) -> None: ...
+    def mount(self, prefix: Text | bytes, adapter: _BaseAdapter) -> None: ...
 
 def session() -> Session: ...