chore: Update link to k8s API conventions

[terrytangyuan]

This link is now located under sig-architecture: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-architecture/api-conventions.md#concurrency-control-and-consistency

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

Checklist:

• My organization is added to USERS.md.

[codecov]

Codecov Report

Merging #5674 (1073462) into master (ec3b82d) will decrease coverage by 0.05%.
The diff coverage is n/a.

❗ Current head 1073462 differs from pull request most recent head 55c786c. Consider uploading reports for the commit 55c786c to get more accurate results

@@            Coverage Diff             @@
##           master    #5674      +/-   ##
==========================================
- Coverage   47.14%   47.08%   -0.06%     
==========================================
  Files         242      242              
  Lines       15135    15135              
==========================================
- Hits         7135     7127       -8     
- Misses       7093     7106      +13     
+ Partials      907      902       -5     

Impacted Files	Coverage Δ
workflow/controller/operator.go	71.11% <ø> (ø)
server/workflow/workflow_server.go	40.45% <0.00%> (-2.28%)	⬇️
cmd/argo/commands/get.go	56.31% <0.00%> (ø)

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