CVE-2026-44660: UltraJSON has a Memory Leak in ujson.dump() on Write Failure

When ujson.dump() writes to a file-like object and the write operation raises an exception, the serialized JSON string object is not decremented, leaking memory. Each failed write operation leaks the full size of the serialized payload.

Code that uses ujson.dumps() rather than ujson.dump() or only JSON load/decode methods is unaffected.