fix(yaffs): fix PLW1641 reported by ruff v0.12.0

Author: qkaiser

python/unblob/handlers/filesystem/yaffs.py

@@ -213,6 +213,9 @@ def __gt__(self, other):
     def __eq__(self, other):
         return self.object_id == other.object_id
 
+    def __hash__(self):
+        return hash(self.object_id)
+
     def __str__(self):
         return f"{self.object_id}: {self.name}"