Maintenance: Remove unnecessary reviewer setting.

.gitlab/dependabot.yml

@@ -11,8 +11,6 @@ updates:
       prefix: "Maintenance:"
     assignees:
       - mg
-    reviewers:
-      - mg
   - package-ecosystem: "npm"
     directory: "/"
     # Always increase the version requirement to match the new version.
@@ -24,5 +22,3 @@ updates:
       prefix: "Maintenance:"
     assignees:
       - dk
-    reviewers:
-      - dk