Rollup merge of rust-lang#123873 - cuviper:mailmap, r=lqd

Merge cuviper in the mailmap

These emails are associated with my GitHub account already, but I might as well
combine my activity for stuff like the Thanks page too.

.mailmap

@@ -307,6 +307,8 @@ Joseph T. Lyons <[email protected]> <[email protected]>
 Josh Cotton <[email protected]>
 Josh Driver <[email protected]>
 Josh Holmer <[email protected]>
+Josh Stone <[email protected]> <[email protected]>
+Josh Stone <[email protected]> <[email protected]>
 Julian Knodt <[email protected]>
 jumbatm <[email protected]> <[email protected]>
 Junyoung Cho <[email protected]>