ggml-et: Fix embed kernels scripts for old python

This allows GGML-ET to build on pre-3.8 python.

Author: z8team

ggml/src/ggml-et/et-kernels/scripts/embed_kernels.py

@@ -6,9 +6,10 @@
 import os
 import argparse
 from pathlib import Path
+from typing import Tuple
 
 
-def embed_elf_as_bytes(elf_path: Path, var_name: str) -> tuple[str, str]:
+def embed_elf_as_bytes(elf_path: Path, var_name: str) -> Tuple[str, str]:
     """
     Read an ELF file and convert it to C byte array declarations.