fix: TT-384 add package azure blob storage to prod.txt

Author: Jobzi

requirements/time_tracker_api/prod.txt

@@ -44,4 +44,7 @@ azure-functions-worker==1.1.9
 
 # Time utils
 pytz==2019.3
-python-dateutil==2.8.1
+python-dateutil==2.8.1
+
+# azure blob storage
+azure-storage-blob==2.1.0