This is a tiny module I regretfully introduced at some point. It's implementation used to be relatively simple, and has since become nothing short of trivial.
In particular, the few uses of it are needlessly using this abstraction layer only to undo the little bit of processing it did.
- Remove use from core and bundled/wmf repos. – https://codesearch.wmflabs.org/search/?q=jquery.getAttrs&i=nope&files=&repos=
- Migrate any on-wiki uses. – https://tools.wmflabs.org/global-search/?q=jquery.getAttrs®ex=1&namespaces=2%2C4%2C8
- Remove in MW 1.35 or 1.36.