Rollup merge of rust-lang#105079 - nnethercote:bots-mailmap, r=jyn514

Add bots to `.mailmap`

r? `@compiler-errors`

.mailmap

@@ -73,6 +73,8 @@ Björn Steinbrink <bsteinbr@gmail.com> <B.Steinbrink@gmx.de>
 blake2-ppc <ulrik.sverdrup@gmail.com> <blake2-ppc>
 boolean_coercion <booleancoercion@gmail.com>
 Boris Egorov <jightuse@gmail.com> <egorov@linux.com>
+bors <bors@rust-lang.org> bors[bot] <26634292+bors[bot]@users.noreply.github.com>
+bors <bors@rust-lang.org> bors[bot] <bors[bot]@users.noreply.github.com>
 Braden Nelson <moonheart08@users.noreply.github.com>
 Brandon Sanderson <singingboyo@gmail.com> Brandon Sanderson <singingboyo@hotmail.com>
 Brett Cannon <brett@python.org> Brett Cannon <brettcannon@users.noreply.github.com>
@@ -139,6 +141,10 @@ David Ross <daboross@daboross.net>
 David Wood <david@davidtw.co> <david.wood@huawei.com>
 Deadbeef <ent3rm4n@gmail.com>
 Deadbeef <ent3rm4n@gmail.com> <fee1-dead-beef@protonmail.com>
+dependabot[bot] <dependabot[bot]@users.noreply.github.com> <27856297+dependabot-preview[bot]@users.noreply.github.com>
+dependabot[bot] <dependabot[bot]@users.noreply.github.com> <49699333+dependabot[bot]@users.noreply.github.com>
+dependabot[bot] <dependabot[bot]@users.noreply.github.com> <dependabot-preview[bot]@users.noreply.github.com>
+dependabot[bot] <dependabot[bot]@users.noreply.github.com> <support@dependabot.com>
 Derek Chiang <derekchiang93@gmail.com> Derek Chiang (Enchi Jiang) <derekchiang93@gmail.com>
 DeveloperC <DeveloperC@protonmail.com>
 Devin Ragotzy <devin.ragotzy@gmail.com>