feat(homebrew): Add option to upgrade all casks

[tuxpeople]

Hi

I had an issue with upgrading as some casks weren't upgraded. I tried to use the cu plugin to upgrade all the casks, including those who wouldn't be upgraded as they are marked as "auto_upgrade". I used this command in my playbook: brew cu -a -y

But I think it should be part of this role, therefore I submit this PR. I tested it locally here.

Before the test:

$ brew outdated --cask --greedy
font-roboto (latest) != latest
font-roboto-mono (latest) != latest
webex-meetings (2211.1803.4212.2) != latest
wireshark (4.0.2) != 4.0.10

After the test:

$ brew outdated --cask --greedy
font-roboto (latest) != latest
font-roboto-mono (latest) != latest

I've no idea about the fonts. Probably there's an issue with the version being latest.

This PR adds a task to the cask part like it already exists in the brew part. It has a similar variable to enable it, and like the task in the brew part, it's disabled by default.

Br

[tuxpeople]

@geerlingguy does it look okay for you?

[stale]

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