[3.5] Configure dependabot (#3919) (#3921)
[3.5] Configure dependabot (#3919) (#3921)

* Configure dependabot

* Update .dependabot/config.yml

Co-Authored-By: Sviatoslav Sydorenko <13bd1fc5137f503b0a8355ad400e7a87ebb45b25@sydorenko.org.ua>
(cherry picked from commit 7c3fe6be)

Co-authored-by: Andrew Svetlov <78ffb02e053fbf34ac072295d1e547d35762892a@gmail.com>
KeepSafe/aiohttp,KeepSafe/aiohttp,KeepSafe/aiohttp