upgrade k8s api to v0.21.3

[sleshchenko]

What does this PR do?:

upgrade k8s api to v0.20.6 v0.21.3 which is version used by devfile/api after devfile/api#565

Which issue(s) this PR fixes:

N/A

PR acceptance criteria:

Testing and documentation do not need to be complete in order for this PR to be approved. We just need to ensure tracking issues are opened.

• Open new test/doc issues under the devfile/api repo
• Check each criteria if:
• There is a separate tracking issue. Add the issue link under the criteria
  or
• test/doc updates are made as part of this PR
• If unchecked, explain why it's not needed

• Unit/Functional tests

• QE Integration test

• Documentation

• Client Impact

How to test changes / Special notes to the reviewer:

[amisevsk]

Updated to k8s v0.21.3 (so that all devfile projects end up in something resembling alignment. v0.21.3 is the k8s api version used for controller-runtime and controller-tools.

[maysunfaisal]

@amisevsk seems like go mod tidy is failing

[sleshchenko]

That's not really go.mod or go.sum state but seems dependency is incompatible with the current go version the project declares. So, upgrading to 1.15, let us know if you have any concerns about it

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maysunfaisal, sleshchenko

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