Annotate pycurl's getinfo() and getinfo_raw() (#14929)

Author: cuu508

stubs/pycurl/pycurl.pyi

@@ -1,6 +1,6 @@
 import sys
 from _typeshed import Incomplete
-from typing import Final, final
+from typing import Any, Final, final
 from typing_extensions import Self
 
 version: str
@@ -22,8 +22,10 @@ class Curl:
     def perform(self) -> None: ...
     def perform_rb(self) -> bytes: ...
     def perform_rs(self) -> str: ...
-    def getinfo(self, info): ...
-    def getinfo_raw(self, info): ...
+    # For getinfo and getinfo_raw, the exact return type depends on the passed value:
+    # http://pycurl.io/docs/latest/curlobject.html#pycurl.Curl.getinfo
+    def getinfo(self, info: int) -> Any: ...
+    def getinfo_raw(self, info: int) -> Any: ...
     def reset(self) -> None: ...
     def unsetopt(self, option: int): ...
     def pause(self, bitmask): ...