Add Python 3.13 as preview with caveat

Author: hallvictoria

articles/azure-functions/functions-reference-python.md

@@ -1079,7 +1079,9 @@ Azure Functions supports the following Python versions:
 
 | Functions version | Python\* versions |
 | ----- | :-----: |
-| 4.x | 3.12<br/>3.11<br/>3.10<br/>|
+| 4.x | 3.13 (Preview)<br/>3.12<br/>3.11<br/>3.10<br/>|
+`> [!IMPORTANT]  
+> Python 3.13 is currently supported on the Flex Consumption, Premium, and Dedicated plans. Python 3.13 support on the Consumption plan is pending.
 
 \* Official Python distributions