chore: Fix maintainer of federation app

Signed-off-by: Joas Schilling <coding@schilljs.com>

.github/CODEOWNERS

@@ -12,7 +12,7 @@
 /apps/dav/tests/unit/CardDAV                  @miaulalala @st3iny @SebastianKrupinski
 /apps/encryption/appinfo/info.xml             @come-nc @icewind1991
 /apps/federatedfilesharing/appinfo/info.xml   @icewind1991 @danxuliu
-/apps/federation/appinfo/info.xml             @datenangebot
+/apps/federation/appinfo/info.xml             @nfebe
 /apps/files/appinfo/info.xml                  @skjnldsv @Pytal @ArtificialOwl @come-nc @artonge @icewind1991 @szaimen @susnux @nfebe
 /apps/files_external/appinfo/info.xml         @icewind1991 @artonge
 /apps/files_reminders/appinfo/info.xml        @Pytal