Rollup merge of #47637 - russmack:fix-mailmap-dupes, r=steveklabnik
Rollup merge of #47637 - russmack:fix-mailmap-dupes, r=steveklabnik

Fix mailmap duplicates, Carol and Brian.

This fix corrects the .mailmap file so that Carol (Nichols || Goulding) appears only once, and Brian Anderson also appears only once.

GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust