Use Final for Pre-Defined Hashing Methods in crypt (#12544)

Author: max-muoto

stdlib/crypt.pyi

@@ -1,12 +1,13 @@
 import sys
+from typing import Final
 
 if sys.platform != "win32":
     class _Method: ...
-    METHOD_CRYPT: _Method
-    METHOD_MD5: _Method
-    METHOD_SHA256: _Method
-    METHOD_SHA512: _Method
-    METHOD_BLOWFISH: _Method
+    METHOD_CRYPT: Final[_Method]
+    METHOD_MD5: Final[_Method]
+    METHOD_SHA256: Final[_Method]
+    METHOD_SHA512: Final[_Method]
+    METHOD_BLOWFISH: Final[_Method]
     methods: list[_Method]
     def mksalt(method: _Method | None = None, *, rounds: int | None = None) -> str: ...
     def crypt(word: str, salt: str | _Method | None = None) -> str: ...