fixed config to be mt5 not regular t5

config.json

@@ -1,7 +1,7 @@
 {
   "_name_or_path": "kravchenko/uk-t5-base",
   "architectures": [
-    "T5ForConditionalGeneration"
+    "MT5ForConditionalGeneration"
   ],
   "d_ff": 2048,
   "d_kv": 64,
@@ -13,7 +13,7 @@
   "initializer_factor": 1.0,
   "is_encoder_decoder": true,
   "layer_norm_epsilon": 1e-06,
-  "model_type": "t5",
+  "model_type": "mt5",
   "num_decoder_layers": 12,
   "num_heads": 12,
   "num_layers": 12,