update dependabot job (#26)

Signed-off-by: Simon Davies <simongdavies@users.noreply.github.com>

Author: simongdavies

.github/dependabot.yml

@@ -1,23 +1,26 @@
-# 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: 
+updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "daily"
       time: "03:00"
+    open-pull-requests-limit: 20
+
   - package-ecosystem: "cargo"
-    directories: 
-      - "/"
+    directories:
+      - "/src/sandbox/runtime"
+      - "/src/code-validator/guest"
     schedule:
       interval: "daily"
       time: "03:00"
+    open-pull-requests-limit: 20
+
   - package-ecosystem: "npm"
-    directory: "/src/js-host-api"
+    directories:
+      - "/"
+      - "/src/code-validator/guest"
     schedule:
       interval: "daily"
       time: "03:00"
+    open-pull-requests-limit: 20