pgaudit/set_user REL2_0_1

on GitHub

GUC deprecation and RESET logic bugfixes

• Fix GUC deprecation logic to stop printing noisy NOTICEs every time
  GUCs are referenced.
• Appropriately check for RESET SESSION AUTHORIZATION and drop invalid
  reference to RESET USER.

This release addresses CVE-2021-38140:

Potential privilege escalation using RESET SESSION AUTHORIZATION after set_user(). This is now blocked along with RESET ROLE.