Update language-support-policy.md

Removing the below entry for PowerShell Core 6 from the Retirement Policy Exceptions table (https://learn.microsoft.com/en-us/azure/azure-functions/language-support-policy#retirement-policy-exceptions).

|PowerShell Core 6| 4 September 2020|30 September 2022|

We've officially retired PS6 from Azure Functions as of 9/30/2022.

-------
cc: @ggailey777

Author: MadhuraBharadwaj-MSFT

articles/azure-functions/language-support-policy.md

@@ -33,7 +33,6 @@ There are few exceptions to the retirement policy outlined above. Here is a list
 |Language Versions                        |EOL Date         |Retirement Date|
 |-----------------------------------------|-----------------|----------------|
 |Node 12|30 Apr 2022|13 December 2022|
-|PowerShell Core 6| 4 September 2020|30 September 2022|
 |Python 3.6 |23 December 2021|30 September 2022|
 
 ## Language version support timeline