Enhance Dependabot config for multiple ecosystems (#20)

Updated Dependabot configuration to include GitHub Actions, Cargo, and NPM with daily update schedules.

Author: simongdavies

.github/dependabot.yml

@@ -0,0 +1,23 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates: 
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      time: "03:00"
+  - package-ecosystem: "cargo"
+    directories: 
+      - "/"
+    schedule:
+      interval: "daily"
+      time: "03:00"
+  - package-ecosystem: "npm"
+    directory: "/src/js-host-api"
+    schedule:
+      interval: "daily"
+      time: "03:00"