Update AAD reference to Microsoft Entra in packaging README template (#47234)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: scottaddie

eng/tools/azure-sdk-tools/packaging_tools/templates/packaging_files/README.md

@@ -24,7 +24,7 @@ pip install azure-identity
 
 ### Authentication
 
-By default, [Azure Active Directory](https://aka.ms/awps/aad) token authentication depends on correct configuration of the following environment variables.
+By default, [Microsoft Entra](https://learn.microsoft.com/entra/fundamentals/what-is-entra) token authentication depends on correct configuration of the following environment variables.
 
 - `AZURE_CLIENT_ID` for Azure client ID.
 - `AZURE_TENANT_ID` for Azure tenant ID.