Switch to using dart run instead of base-VM command (#1476)

.github/workflows/gh-pages.yml

@@ -28,7 +28,7 @@ jobs:
         working-directory: web/_tool
 
       - name: Build
-        run: dart _tool/build_ci.dart
+        run: dart run _tool/build_ci.dart
         working-directory: web
 
       - name: Deploy

.github/workflows/verify-web-demos.yml

@@ -32,5 +32,5 @@ jobs:
         run: dart pub get
         working-directory: web/_tool
       - name: Verify packages
-        run: dart _tool/verify_packages.dart
+        run: dart run _tool/verify_packages.dart
         working-directory: web

web/readme.md

@@ -32,7 +32,7 @@ $ flutter pub global activate peanut
 Verify `pub get` has been run on each demo:
 
 ```console
-$ dart _tool/verify_packages.dart
+$ dart run _tool/verify_packages.dart
 ```
 
 Build all demos, along with the sample index: