pgk/capabilities: modernize, switch to github.com/moby/sys/capability

[kolyshkin]

This PR improves pkg/capabilities and switches it to using the new fork. Please see individual commits for details.

Currently a draft pending

• https://github.com/containers/storage/pull/2103
• https://github.com/moby/sys/pull/154
• TODO: runtime-tools PR

github.com/moby/sys/capability fork of the (no longer maintained) github.com/syndtr/gocapability package.

For changes since the fork took place, see https://github.com/moby/sys/blob/main/capability/CHANGELOG.md

[packit-as-a-service[bot]]

Ephemeral COPR build failed. @containers/packit-build please check.

[packit-as-a-service[bot]]

Ephemeral COPR build failed. @containers/packit-build please check.

[Luap99]

cross build for darwin is failing

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kolyshkin, Luap99

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[rhatdan]

/lgtm