Downpin due to mypy issue (#134)

* Downpin due to mypy issue

* Update requirements.txt

Author: dciborow

ai-python/retail/requirements.txt

@@ -1,5 +1,5 @@
 azure-identity
-azure-storage-file-datalake
+azure-storage-file-datalake==12.3.1
 azureml-core==1.32.0
 commondatamodel-objectmodel
 recommenders

requirements.txt

@@ -20,7 +20,7 @@ azure-search-documents==11.1.0b3
 azure-servicebus==0.50.3
 azure-storage-blob<13.0.0,>=12.6.0
 azure-storage-common==2.1.0
-azure-storage-file-datalake
+azure-storage-file-datalake==12.3.1
 azure-storage-file==2.1.0
 azure-storage-nspkg==3.1.0
 azure-storage-queue==12.1.6