docs: Update USERS.md (argoproj#20349)

Added Pvotal technologies to the official user list

Signed-off-by: Ashley Manraj <90852185+a-manraj-pvotal@users.noreply.github.com>
Signed-off-by: austin5219 <3936059+austin5219@users.noreply.github.com>

USERS.md

@@ -273,6 +273,7 @@ Currently, the following organizations are **officially** using Argo CD:
 1. [PT Boer Technology (Btech)](https://btech.id/)
 1. [PUBG](https://www.pubg.com)
 1. [Puzzle ITC](https://www.puzzle.ch/)
+1. [Pvotal Technologies](https://pvotal.tech/)
 1. [Qonto](https://qonto.com)
 1. [QuintoAndar](https://quintoandar.com.br)
 1. [Quipper](https://www.quipper.com/)