fix nullability of scrypt params (#10942)

stdlib/hashlib.pyi

@@ -113,14 +113,7 @@ shake_128 = _VarLenHash
 shake_256 = _VarLenHash
 
 def scrypt(
-    password: ReadableBuffer,
-    *,
-    salt: ReadableBuffer | None = None,
-    n: int | None = None,
-    r: int | None = None,
-    p: int | None = None,
-    maxmem: int = 0,
-    dklen: int = 64,
+    password: ReadableBuffer, *, salt: ReadableBuffer, n: int, r: int, p: int, maxmem: int = 0, dklen: int = 64
 ) -> bytes: ...
 @final
 class _BlakeHash(_Hash):

tests/stubtest_allowlists/py3_common.txt

@@ -416,6 +416,7 @@ csv.DictWriter.__init__  # runtime sig has *args but will error if more than 5 p
 
 contextvars.Context.__init__  # C signature is broader than what is actually accepted
 dataclasses.field  # White lies around defaults
+hashlib.scrypt  # Raises TypeError if salt, n, r or p are None
 hashlib.sha3_\d+  # Can be a class or a built-in function, can't be subclassed at runtime
 hashlib.shake_\d+  # Can be a class or a built-in function, can't be subclassed at runtime
 hmac.HMAC.blocksize  # use block_size instead