Be able to sort widgets on dashboard by number of updates required

[ewancolyer]

Is your feature request related to a problem? Please describe.
On my dashboard I would like to be able easily see the app that has the most about of updates required

Describe the solution you'd like
On the dashboard I would like to be able to sort the "Pending Apple Updates" and "pending 3rd party updates" widgets by order of updates required as well as alphabetical

[grahamgilbert]

I’ll gladly take a PR for this if you want to contribute one.