chore(deps): bump containerd and opencontainers/images-spec

[briandealwis]

address CVE-2021-41190 by updating to containerd v1.5.8
and opencontainers/images-spec v1.0.2

[codecov]

Codecov Report

Merging #6876 (789db8e) into main (290280e) will decrease coverage by 1.35%.
The diff coverage is 61.83%.

@@            Coverage Diff             @@
##             main    #6876      +/-   ##
==========================================
- Coverage   70.48%   69.12%   -1.36%     
==========================================
  Files         515      547      +32     
  Lines       23150    25081    +1931     
==========================================
+ Hits        16317    17338    +1021     
- Misses       5776     6577     +801     
- Partials     1057     1166     +109     

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/flags.go	91.00% <0.00%> (+0.18%)	⬆️
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/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 163 more

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