Change Dependabot from npm to pub.dev updates

Updated Dependabot configuration to enable version updates for pub.dev instead of npm.

Author: tqha1011

.github/dependabot.yml

@@ -1,10 +1,9 @@
 version: 2
 updates:
-  # Enable version updates for npm
+  # Enable version updates for pub dev
   - package-ecosystem: "pub"
-    # Look for `package.json` and `lock` files in the `root` directory
     directory: "/src"
-    # Check the npm registry for updates every day (weekdays)
+    # Check the pub registry for updates every day (weekdays)
     schedule:
       interval: "weekly"
     commit-message: