build: simplify using Golang 1.16

[alexec]

Signed-off-by: Alex Collins alex_collins@intuit.com
See #6890
See #5563

[codecov]

Codecov Report

Merging #6893 (04d4d63) into master (ef6aad6) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6893   +/-   ##
=======================================
  Coverage   48.49%   48.50%           
=======================================
  Files         265      265           
  Lines       19258    19259    +1     
=======================================
+ Hits         9340     9342    +2     
  Misses       8865     8865           
+ Partials     1053     1052    -1     

Impacted Files	Coverage Δ
workflow/metrics/server.go	15.78% <0.00%> (-3.51%)	⬇️
workflow/controller/operator.go	71.06% <0.00%> (-0.15%)	⬇️
workflow/util/util.go	45.78% <0.00%> (+1.00%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ef6aad6...04d4d63. Read the comment docs.

[alexec]

bash: /home/runner/go/pkg/mod/k8s.io/code-generator@v0.21.5/generate-groups.sh: No such file or directory