try simpler json regex

Author: iscai-msft

sdk/core/azure-core/azure/core/pipeline/policies/_universal.py

@@ -511,7 +511,7 @@ class ContentDecodePolicy(SansIOHTTPPolicy):
     :type response_encoding: str
     """
     # Accept "text" because we're open minded people...
-    JSON_REGEXP = re.compile(r'^(application|text)/([0-9a-z+.-]+\+)?json$')
+    JSON_REGEXP = re.compile(r'^(application|text)/(.+\+)?json$')
 
     # Name used in context
     CONTEXT_NAME = "deserialized_data"