docs: add OpsVerse as an official user (USERS.md)

[sat-devopsnow]

OpsVerse uses ArgoCD (et al) across its cloud native infrastructure and is an advocate for it within its community.

Signed-off-by: sat-devopsnow sat@opsverse.io

Checklist:

• (c) this does not need to be in the release notes.
• This PR does not require and documentation / issue closing
• Optional. My organization is added to USERS.md.
• I have signed off all my commits as required by DCO

[codecov]

Codecov Report

Merging #10436 (a2a4936) into master (202b69a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #10436   +/-   ##
=======================================
  Coverage   45.76%   45.76%           
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  Files         233      233           
  Lines       28401    28401           
=======================================
  Hits        12998    12998           
  Misses      13629    13629           
  Partials     1774     1774           

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