docs: Add Akuity to the list of users

[terrytangyuan]

Signed-off-by: Yuan Tang terrytangyuan@gmail.com

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• Maybe add you organization to USERS.md.
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[codecov]

Codecov Report

Merging #6969 (d3f17a7) into master (cf9a6cd) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6969      +/-   ##
==========================================
+ Coverage   48.49%   48.51%   +0.02%     
==========================================
  Files         265      265              
  Lines       19267    19267              
==========================================
+ Hits         9343     9348       +5     
+ Misses       8873     8864       -9     
- Partials     1051     1055       +4     

Impacted Files	Coverage Δ
workflow/metrics/server.go	15.78% <0.00%> (-3.51%)	⬇️
cmd/argoexec/commands/emissary.go	50.35% <0.00%> (-1.44%)	⬇️
server/workflow/workflow_server.go	46.80% <0.00%> (+2.39%)	⬆️

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