docs: add Glovo to users

[cmontemuino]

Checklist:

• My organization is added to USERS.md.

[codecov]

Codecov Report

Merging #6098 (366be2d) into master (c183058) will not change coverage.
The diff coverage is n/a.

❗ Current head 366be2d differs from pull request most recent head 34af869. Consider uploading reports for the commit 34af869 to get more accurate results

@@           Coverage Diff           @@
##           master    #6098   +/-   ##
=======================================
  Coverage   47.76%   47.76%           
=======================================
  Files         249      249           
  Lines       15739    15739           
=======================================
  Hits         7518     7518           
- Misses       7280     7282    +2     
+ Partials      941      939    -2     

Impacted Files	Coverage Δ
cmd/argo/commands/get.go	57.09% <0.00%> (-0.65%)	⬇️
cmd/argoexec/commands/emissary.go	50.00% <0.00%> (+1.56%)	⬆️

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[alexec]

How can we confirm your relationship with Glovo
please?

[cmontemuino]

How can we confirm your relationship with Glovo
please?

Yes, I do confirm. I've signed-off the commit with my email at Glovo