Rollup merge of rust-lang#117086 - amandasystems:patch-1, r=Mark-Simulacrum

Update .mailmap to promote my livename

I had apparently forgotten to update the Rust mailmap file for my previous commits. I was sent here from [the about page!](https://thanks.rust-lang.org/about/).

Note that the second rule only fires for commits I do at my current place of work, but reclaim them under my personal email address that I expect to use for longer.