It seems `T5WithLMHead` is outdated

Leaving it for potential older versions of the lib.
But adding it so that `infer_framework_load_model` from the pipeline can load the model directly without needing to refer to the pipeline task.

https://github.com/huggingface/transformers/blob/main/src/transformers/models/t5/modeling_t5.py#L1466

config.json

@@ -1,6 +1,7 @@
 {
   "architectures": [
-    "T5WithLMHeadModel"
+    "T5WithLMHeadModel",
+    "T5ForConditionalGeneration"
   ],
   "d_ff": 2048,
   "d_kv": 64,