ci: update dependabot config

Author: caarlos0

.github/dependabot.yml

@@ -8,7 +8,7 @@ updates:
     labels:
       - "dependencies"
     commit-message:
-      prefix: "feat"
+      prefix: "chore"
       include: "scope"
   - package-ecosystem: "github-actions"
     directory: "/"
@@ -28,6 +28,5 @@ updates:
     labels:
       - "dependencies"
     commit-message:
-      prefix: "feat"
+      prefix: "chore"
       include: "scope"
-