Style guide proposal: defensively quote _all_ YAML strings

[mfisher87]

It doesn't matter how long you've been using YAML and how aware of its pitfalls you are. This kind of thing will eventually bite you as it did me today: https://github.com/nsidc/earthaccess/actions/runs/11747889420/job/32730773288?pr=876

This happened because I changed the value of a YAML field from 3.9 -> 3.10. This evaluates to 3.1 because YAML has more pitfalls than one can reasonably memorize. The correct change was 3.9 -> "3.10". IMO, we should be defensively quoting all of our strings.

[jhkennedy]

Big 🤷 from me -- I think it reads better without quotes and I'm lazy so don't want to type them 🤣 , but that will bite you occasionally. I'm fine with adopting that as the style here though if there's quarum. There's not really a good reason not to.