Patch release v5.13.1

This patch is focused on enabling transformers for the latest release of vllm!

• Be more defensive with remap_legacy_layer_types for custom models (#47245) from @hmellor
• Fix custom code which doesn't know about the new linear layer type names (#47174) from @hmellor
• Fix case where _LazyAutoMapping.register is passed a str key (#47148) from @hmellor