[pgadmin-org/pgadmin4] d21e1e: Update release notes

[Aditya Toshniwal]

  Branch: refs/heads/master
  Home:   https://github.com/pgadmin-org/pgadmin4
  Commit: d21e1eb17ec507b0d321e4b6ede0fac9c75f89a8
      
https://github.com/pgadmin-org/pgadmin4/commit/d21e1eb17ec507b0d321e4b6ede0fac9c75f89a8
  Author: Aditya Toshniwal <aditya.toshni...@enterprisedb.com>
  Date:   2023-06-19 (Mon, 19 Jun 2023)

  Changed paths:
    M docs/en_US/release_notes_7_4.rst

  Log Message:
  -----------
  Update release notes