chore: configure dependabot (aws#3313)

.dependabot/config.yml

@@ -0,0 +1,14 @@
+---
+# See: https://dependabot.com/docs/config-file/
+version: 1
+update_configs:
+  # Dependabot will detect the lerna mono-repo and discover packages in there
+  - directory: /
+    package_manager: javascript
+    update_schedule: live
+    ignored_updates:
+      - match:
+          # Don't suggest upgrading @types/node to versions >= 9
+          dependency_name: @types/node
+          version_requirements: '>= 9'
+    version_requirement_updates: increase_versions