mailmap: add Ethan Carter Edwards

Signed-off-by: Ethan Carter Edwards <ethan@ethancedwards.com>

Author: ethancedwards8

.mailmap

@@ -5,6 +5,7 @@ Christina Sørensen <christina@cafkafk.com>
 Christina Sørensen <christina@cafkafk.com> <christinaafk@gmail.com>
 Christina Sørensen <christina@cafkafk.com> <89321978+cafkafk@users.noreply.github.com>
 Daniel Løvbrøtte Olsen <me@dandellion.xyz> <daniel.olsen99@gmail.com>
+Ethan Carter Edwards <ethan@ethancedwards.com> Ethan Edwards <ethancarteredwards@gmail.com>
 Fabian Affolter <mail@fabian-affolter.ch> <fabian@affolter-engineering.ch>
 Fiona Behrens <me@kloenk.dev>
 Fiona Behrens <me@kloenk.dev> <me@kloenk.de>