Silence some pytype errors.

PiperOrigin-RevId: 623381193

Author: ise-crypto

python/tink/streaming_aead/_decrypting_stream.py

@@ -131,5 +131,5 @@ def readable(self) -> bool:
     """Return True if the stream can be read from."""
     return True
 
-  def write(self, b: bytes) -> int:
+  def write(self, b: bytes) -> int:  # pytype: disable=signature-mismatch
     raise io.UnsupportedOperation()

python/tink/streaming_aead/_encrypting_stream.py

@@ -73,7 +73,7 @@ def _close_cc_encrypting_stream(self) -> None:
   def readinto(self, b: bytearray) -> Optional[int]:
     raise io.UnsupportedOperation()
 
-  def write(self, b: bytes) -> int:
+  def write(self, b: bytes) -> int:  # pytype: disable=signature-mismatch
     """Write the given buffer to the IO stream.
 
     Args: