chore: Fix Dependabot configuration file (#190)

Author: lookasc

.github/dependabot.yml

@@ -1,7 +1,9 @@
 version: 2
 
 updates:
-  - package-ecosystem: 'yarn'
+  - package-ecosystem: 'npm'
     # this will ensure that dependabot will only scan the packages in the root directory
     # omitting the packages in the /examples directory
     directory: '/'
+    schedule:
+      interval: 'monthly'