Update cnab-to-oci to v0.3.0-beta2

[zappy-shu]

- What I did

Updates vendor of cnab-to-oci to v0.3.0-beta2:

• Push images using relocation map first, then from the bundle
• Fix Docker CLI authentication to registries for the push
• Simplify error message returned when pulling CNAB bundle that is not found

- How to verify it

Attempt to pull an app that does not exist. E.g. docker app pull carolinebriaud/vapp

The error message should now be simplified to:

carolinebriaud/vapp: docker.io/carolinebriaud/vapp:latest: not found

- Description for the changelog Simplify error message returned when pulling CNAB bundle that is not found

- A picture of a cute animal (not mandatory)

[codecov[bot]]

Codecov Report

Merging #766 into master will decrease coverage by 0.11%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #766      +/-   ##
==========================================
- Coverage   69.66%   69.55%   -0.12%     
==========================================
  Files          64       64              
  Lines        3597     3567      -30     
==========================================
- Hits         2506     2481      -25     
+ Misses        760      758       -2     
+ Partials      331      328       -3

Impacted Files	Coverage Δ
internal/commands/image/rm.go	58.62% <0%> (-3.88%)	:arrow_down:
types/parameters/parameters.go	92.06% <0%> (-1.59%)	:arrow_down:
internal/store/bundle.go	76.41% <0%> (-0.17%)	:arrow_down:

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[eunomie]

I think we can close it as the bump as been done in https://github.com/docker/app/pull/748