[stdlib] Update fromhex method bytes and bytesarray (#15103)

docs:
https://docs.python.org/dev/library/stdtypes.html#bytes.fromhex
https://docs.python.org/dev/library/stdtypes.html#bytearray.fromhex

Author: guoci

stdlib/builtins.pyi

@@ -731,8 +731,13 @@ class bytes(Sequence[int]):
     def translate(self, table: ReadableBuffer | None, /, delete: ReadableBuffer = b"") -> bytes: ...
     def upper(self) -> bytes: ...
     def zfill(self, width: SupportsIndex, /) -> bytes: ...
-    @classmethod
-    def fromhex(cls, string: str, /) -> Self: ...
+    if sys.version_info >= (3, 14):
+        @classmethod
+        def fromhex(cls, string: str | ReadableBuffer, /) -> Self: ...
+    else:
+        @classmethod
+        def fromhex(cls, string: str, /) -> Self: ...
+
     @staticmethod
     def maketrans(frm: ReadableBuffer, to: ReadableBuffer, /) -> bytes: ...
     def __len__(self) -> int: ...
@@ -836,8 +841,13 @@ class bytearray(MutableSequence[int]):
     def translate(self, table: ReadableBuffer | None, /, delete: bytes = b"") -> bytearray: ...
     def upper(self) -> bytearray: ...
     def zfill(self, width: SupportsIndex, /) -> bytearray: ...
-    @classmethod
-    def fromhex(cls, string: str, /) -> Self: ...
+    if sys.version_info >= (3, 14):
+        @classmethod
+        def fromhex(cls, string: str | ReadableBuffer, /) -> Self: ...
+    else:
+        @classmethod
+        def fromhex(cls, string: str, /) -> Self: ...
+
     @staticmethod
     def maketrans(frm: ReadableBuffer, to: ReadableBuffer, /) -> bytes: ...
     def __len__(self) -> int: ...