Merge pull request #10667 from nextcloud/backport/10665/stable26

[stable26] Remove vitormattos from codeowners

Author: nickvergessen

.github/CODEOWNERS

@@ -8,5 +8,5 @@
 /developer_manual/client_apis/OCS/ocs-status-api.rst        @Antreesy @nickvergessen
 /developer_manual/digging_deeper/groupware/                 @ChristophWurst
 /developer_manual/digging_deeper/groupware/calendar.rst     @miaulalala
-/developer_manual/digging_deeper/talk.rst                   @nickvergessen @vitormattos
+/developer_manual/digging_deeper/talk.rst                   @nickvergessen
 /user_manual/talk/                                          @Antreesy @nickvergessen @ShGKme