ggml updates RPC backend to handle dynamic memory allocation for specific operations.

The official source reports this update: b10699: ggml : add ggml_backend_op_alloc_size_may_expand, use it in RPC. ggml : add ggml_backend_op_alloc_size_may_expand, use it in RPC ( #27960 ) some backends (Metal, SYCL, WebGPU) require additional memory for fleeting data for certain ops, which is reflected in their get_alloc_size implementations. add ggml_backend_op_alloc_size_may_expand() to the backend utils, listing these ops, and assert in ggml_backend_buft_get_alloc_size that a backend expanding the alloc size of a compute op only does so for ops listed in the helper.