Add possibility to skip checking of specific actions/versions

[Eugene]

Is your feature request related to a problem? Please describe.
Sometimes I don't want to update main or master to specific version but I don't have a possibility to skip such cases.

Describe the solution you'd like

$ ghacu --skip-version main # doesn't suggest to upgrade actions that have @main as a version
$ ghacu --skip-action fabasoad/setup-mint-action # doesn't suggest to upgrade this specific action even if it's out of date

Describe alternatives you've considered
None.

Additional context
N/A