Use CODEOWNERS instead of deprecated dependbot/reviewers

Signed-off-by: yubiuser <[email protected]>

Author: yubiuser

.github/CODEOWNERS

@@ -0,0 +1,5 @@
+# see https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners#codeowners-syntax
+
+# These owners will be the default owners for everything in
+# the repo. Unless a later match takes precedence,
+*       @pi-hole/docker-maintainers

.github/dependabot.yml

@@ -7,6 +7,4 @@ updates:
       interval: "weekly"
       day: saturday
       time: "10:00"
-    target-branch: master
-    reviewers:
-      - "pi-hole/docker-maintainers"
+    target-branch: master