chore: use dart run instead of flutter pub run (#401)

Author: a7medev

.circleci/config.yml

@@ -97,7 +97,7 @@ jobs:
       - checkout
       - run: flutter pub get
       - run: sh ./scripts/pigeon.sh
-      - run: flutter pub run build_runner build --delete-conflicting-outputs
+      - run: dart run build_runner build --delete-conflicting-outputs
       - run: flutter test --coverage
       - run:
           working_directory: coverage
@@ -194,7 +194,7 @@ jobs:
       - checkout
       - run: flutter pub get
       - run: sh ./scripts/pigeon.sh
-      - run: flutter pub run build_runner build --delete-conflicting-outputs
+      - run: dart run build_runner build --delete-conflicting-outputs
       - run:
           name: Perform Static Analysis
           command: flutter analyze
@@ -206,10 +206,10 @@ jobs:
       - checkout
       - run: flutter pub get
       - run: sh ./scripts/pigeon.sh
-      - run: flutter pub run build_runner build --delete-conflicting-outputs
+      - run: dart run build_runner build --delete-conflicting-outputs
       - run:
           name: Check Package Score
-          command: flutter pub run pana --no-warning --exit-code-threshold 0
+          command: dart run pana --no-warning --exit-code-threshold 0
       - run: flutter pub publish --dry-run
 
   release:

scripts/pigeon.sh

@@ -14,7 +14,7 @@ generate_pigeon() {
   name_snake=$(basename $name_file .api.dart)
   name_pascal=$(echo "$name_snake" | perl -pe 's/(^|_)./uc($&)/ge;s/_//g')
 
-  flutter pub run pigeon \
+  dart run pigeon \
       --input "pigeons/$name_snake.api.dart" \
       --dart_out "$DIR_DART/$name_snake.api.g.dart" \
       --objc_header_out "$DIR_IOS/${name_pascal}Pigeon.h" \