Update stale/deprecated LaTeX packages

[asberk]

Thank you for your effort in maintaining this document template.

It's worth noting that some packages appearing in the template are now out-dated and superseded by newer packages. For example, it is my understanding that subcaption supersedes subfig and that the latter should not be used. Similarly, I believe that one of the packages for the Times typeface has also been superseded by a newer package.

I don't have time to submit a PR right now, but I will revisit this later if someone doesn't beat me to it first.