chore: update dependabot settings (#538)

Author: dkrutskikh

.github/dependabot.yml

@@ -10,14 +10,21 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+    assignees:
+      - "dependabot"
+    reviewers:
+      - "incendial"
+      - "dkrutskikh"
+    commit-message:
+      prefix: "chore: "
 
   # Maintain dependencies for npm
   - package-ecosystem: "npm"
     directory: "website"
     schedule:
       interval: "daily"
     assignees:
-      - "octocat"
+      - "dependabot"
     reviewers:
       - "incendial"
       - "dkrutskikh"