Fix failed import of ST RoBERTa models (#637)

Fixes an error uploading the sentence-transformers/all-distilroberta-v1 model
which failed with "missing 2 required positional arguments: 'token_type_ids' 
and 'position_ids'". The cause was that the tokenizer type was not recognised 
due to a typo

eland/ml/pytorch/transformers.py

@@ -311,7 +311,7 @@ class _SentenceTransformerWrapperModule(nn.Module):  # type: ignore
             (
                 transformers.BartTokenizer,
                 transformers.MPNetTokenizer,
-                transformers.RobertaConfig,
+                transformers.RobertaTokenizer,
                 transformers.XLMRobertaTokenizer,
             ),
         ):

tests/ml/pytorch/test_pytorch_model_config_pytest.py

@@ -77,6 +77,14 @@ pytestmark = [
 # have been imported
 if HAS_PYTORCH and HAS_SKLEARN and HAS_TRANSFORMERS:
     MODEL_CONFIGURATIONS = [
+        (
+            "sentence-transformers/all-distilroberta-v1",
+            "text_embedding",
+            TextEmbeddingInferenceOptions,
+            NlpRobertaTokenizationConfig,
+            512,
+            768,
+        ),
         (
             "intfloat/multilingual-e5-small",
             "text_embedding",