docs: Mention #6712 in upgrading guide

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Codecov Report

Merging #6992 (48da396) into master (a2d15c3) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 48da396 differs from pull request most recent head cc92614. Consider uploading reports for the commit cc92614 to get more accurate results

@@            Coverage Diff             @@
##           master    #6992      +/-   ##
==========================================
+ Coverage   48.50%   48.51%   +0.01%     
==========================================
  Files         265      265              
  Lines       19272    19272              
==========================================
+ Hits         9348     9350       +2     
  Misses       8869     8869              
+ Partials     1055     1053       -2     

Impacted Files	Coverage Δ
workflow/controller/operator.go	71.13% <0.00%> (-0.10%)	⬇️
cmd/argo/commands/get.go	58.89% <0.00%> (+0.58%)	⬆️
cmd/argoexec/commands/emissary.go	51.79% <0.00%> (+1.43%)	⬆️

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