[formrecognizer] update azure-core min dep version (Azure#15519)

* update azure-core min dep version

* update shared reqs for FR

Author: kristapratico

sdk/formrecognizer/azure-ai-formrecognizer/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## 3.1.0b2 (Unreleased)
 
+**Bug Fixes**
+
+- Package requires [azure-core](https://pypi.org/project/azure-core/) version 1.8.2 or greater
+
 
 ## 3.1.0b1 (2020-11-23)
 

sdk/formrecognizer/azure-ai-formrecognizer/setup.py

@@ -79,7 +79,7 @@
         'azure.ai',
     ]),
     install_requires=[
-        "azure-core<2.0.0,>=1.6.0",
+        "azure-core<2.0.0,>=1.8.2",
         "msrest>=0.6.12",
         'six>=1.6',
         'azure-common~=1.1',

shared_requirements.txt

@@ -137,7 +137,7 @@ avro<2.0.0,>=1.10.0
 #override azure-ai-textanalytics azure-core<2.0.0,>=1.4.0
 #override azure-search-documents azure-core<2.0.0,>=1.4.0
 #override azure-ai-formrecognizer msrest>=0.6.12
-#override azure-ai-formrecognizer azure-core<2.0.0,>=1.6.0
+#override azure-ai-formrecognizer azure-core<2.0.0,>=1.8.2
 #override azure-storage-blob azure-core<2.0.0,>=1.9.0
 #override azure-storage-blob msrest>=0.6.10
 #override azure-storage-blob-changefeed azure-storage-blob>=12.5.0,<13.0.0