Change deprecated product

Author: chahak13

diffmpm/io.py

@@ -130,7 +130,7 @@ def _parse_mesh(self, config):
         if config["mesh"]["type"] == "generator":
             elements = element_cls(
                 config["mesh"]["nelements"],
-                jnp.product(jnp.array(config["mesh"]["nelements"])),
+                jnp.prod(jnp.array(config["mesh"]["nelements"])),
                 config["mesh"]["element_length"],
                 constraints,
                 concentrated_nodal_forces=self.parsed_config["external_loading"][