fix: use go 1.17.x in verify-examples github action

[MarlonGamez]

Description
This PR uses the setup-go action to make sure we are using go v1.17.x in our job that verifies changes to skaffold's examples.

[codecov]

Codecov Report

Merging #7088 (2bfd1e8) into main (290280e) will decrease coverage by 1.82%.
The diff coverage is 56.96%.

@@            Coverage Diff             @@
##             main    #7088      +/-   ##
==========================================
- Coverage   70.48%   68.66%   -1.83%     
==========================================
  Files         515      558      +43     
  Lines       23150    26080    +2930     
==========================================
+ Hits        16317    17907    +1590     
- Misses       5776     6942    +1166     
- Partials     1057     1231     +174     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/deploy.go	52.00% <ø> (-1.85%)	⬇️
cmd/skaffold/app/cmd/dev.go	84.61% <0.00%> (ø)
cmd/skaffold/app/cmd/render.go	36.66% <0.00%> (-4.72%)	⬇️
cmd/skaffold/skaffold.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/inspect_tests.go	62.50% <14.28%> (-1.14%)	⬇️
cmd/skaffold/app/cmd/lsp.go	28.12% <28.12%> (ø)
cmd/skaffold/app/cmd/fix.go	68.85% <40.00%> (-7.62%)	⬇️
cmd/skaffold/app/cmd/lint.go	42.85% <42.85%> (ø)
cmd/skaffold/app/cmd/find_configs.go	48.88% <50.00%> (+0.24%)	⬆️
cmd/skaffold/app/skaffold.go	76.19% <70.00%> (-8.43%)	⬇️
... and 209 more

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[tejal29]

kokoro job failed due to timeout. Retriggering.

[MarlonGamez]

@tejal29 I think this has been happening consistently on all PRs I've seen. I'll open an issue for this

[MarlonGamez]

Merging this as kokoro failure is unrelated