Add ZipFile.mkdir (new in 3.11) (#7769)

stdlib/zipfile.pyi

@@ -222,6 +222,8 @@ class ZipFile:
         ) -> None: ...
     else:
         def writestr(self, zinfo_or_arcname: str | ZipInfo, data: bytes | str, compress_type: int | None = ...) -> None: ...
+    if sys.version_info >= (3, 11):
+        def mkdir(self, zinfo_or_directory: str | ZipInfo, mode: int = ...) -> None: ...
 
 class PyZipFile(ZipFile):
     def __init__(