ci(dependabot): add config for browser-tests npm dependencies

Author: tuomas777

.github/dependabot.yml

@@ -8,3 +8,12 @@ updates:
       prefix: "deps"
     # Disable version updates and only allow security updates
     open-pull-requests-limit: 0
+
+  - package-ecosystem: "npm"
+    directory: "/browser-tests"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: "deps"
+    # Disable version updates and only allow security updates
+    open-pull-requests-limit: 0