Update version of `docker/login-action` for `node12` and `set-output` warnings.

[goulter]

As seen here, the cache-new-image job still has 2 warnings, which will generate errors down the road.

Use v2 of docker/login-action as stated here for Docker half of the node warning. That should also take care of the set-output warning since its a newer version.
More info also here

For the actions/checkout warning, use v3 of actions/checkout. Like this chat.