Add zipimporter.find_spec() and zipimporter.invalidate_caches() (#6446)

Co-authored-by: Akuli <akuviljanen17@gmail.com>

stdlib/zipimport.pyi

@@ -1,5 +1,6 @@
 import os
 import sys
+from importlib.machinery import ModuleSpec
 from types import CodeType, ModuleType
 from typing import Any
 
@@ -22,3 +23,6 @@ class zipimporter(object):
     def get_source(self, fullname: str) -> str | None: ...
     def is_package(self, fullname: str) -> bool: ...
     def load_module(self, fullname: str) -> ModuleType: ...
+    if sys.version_info >= (3, 10):
+        def find_spec(self, fullname: str, target: ModuleType | None = ...) -> ModuleSpec | None: ...
+        def invalidate_caches(self) -> None: ...