ci: add dart pub get for release (#415)

Jira ID: [\[MOB-13261\] Fix failing CI for pigeon generation](https://instabug.atlassian.net/browse/MOB-13261)

Author: abdelhamid-f-nasser

.circleci/config.yml

@@ -248,6 +248,10 @@ jobs:
       - flutter/install_sdk_and_pub:
           flutter_version: 3.3.6
           app-dir: project
+      - run:
+          name: Install pub packages
+          working_directory: ~/project
+          command: dart pub get
       - run:
           name: Generate Pigeons
           working_directory: project