chore: Fix expr array equality operator

[crenshaw-dev]

Corroborated by expr docs and one person's test in the CNCF Slack.

Checklist:

• My organization is added to USERS.md.

[codecov]

Codecov Report

Merging #5744 (0751265) into master (284adfe) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5744      +/-   ##
==========================================
+ Coverage   46.75%   46.78%   +0.03%     
==========================================
  Files         244      244              
  Lines       15270    15270              
==========================================
+ Hits         7139     7144       +5     
+ Misses       7227     7216      -11     
- Partials      904      910       +6     

Impacted Files	Coverage Δ
workflow/controller/operator.go	70.85% <0.00%> (-0.27%)	⬇️
cmd/argo/commands/get.go	56.31% <0.00%> (+0.64%)	⬆️
server/workflow/workflow_server.go	42.73% <0.00%> (+2.27%)	⬆️

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[alexec]

Great stuff - thank you!