go.mod: github.com/containerd/containerd v1.7.20, switch to github.com/containerd/platforms, github.com/distribution/reference module

[thaJeztah]

• follow-up to go.mod: github.com/containerd/containerd v1.7.18, switch to github.com/containerd/errdefs module #599

go.mod: github.com/containerd/containerd v1.7.20

• switches to separate github.com/containerd/containerd/api module
• switches to separate github.com/containerd/platforms module

full diff: containerd/containerd@v1.7.18...v1.7.20

switch to github.com/containerd/platforms module

containerd 1.7.19 and up alias the platforms package to the new module,
and deprecate the package.

switch to github.com/distribution/reference module

containerd 1.7.19 and up alias the reference/docker package to the new module,
and deprecate the package.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 34.36%. Comparing base (d5701f0) to head (261dd69).
Report is 4 commits behind head on main.

Files	Patch %	Lines
pkg/auth/keychain.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #610   +/-   ##
=======================================
  Coverage   34.36%   34.36%           
=======================================
  Files          65       65           
  Lines        6606     6606           
=======================================
  Hits         2270     2270           
  Misses       4021     4021           
  Partials      315      315           

Files	Coverage Δ
pkg/auth/image_proxy.go	75.43% <ø> (ø)
pkg/remote/remotes/handlers.go	15.22% <ø> (ø)
pkg/stargz/resolver.go	30.95% <100.00%> (ø)
pkg/utils/registry/registry.go	33.33% <100.00%> (ø)
pkg/auth/keychain.go	31.48% <0.00%> (ø)

[imeoer]

Thanks, LGTM.