Update dependabot.yml

Author: ThomasJejkal

.github/dependabot.yml

@@ -7,9 +7,11 @@ version: 2
 updates:
   - package-ecosystem: "npm" # See documentation for possible values
     directory: "/" # Location of package manifests
+    target-branch: "dev"
     schedule:
       interval: "monthly"
   - package-ecosystem: "github-actions"
     directory: "/"
+    target-branch: "dev"
     schedule:
       interval: "weekly"