chore: Update Flutter version (#353)

Co-authored-by: fkorotkov <[email protected]>

Author: github-actions[bot]

.cirrus.yml

@@ -6,11 +6,11 @@ docker_builder:
     # from https://flutter.dev/docs/development/tools/sdk/releases
     matrix:
       - DOCKER_TAG: latest
-        FLUTTER_VERSION: 3.27.3
+        FLUTTER_VERSION: 3.29.0
       - DOCKER_TAG: stable
-        FLUTTER_VERSION: 3.27.3
+        FLUTTER_VERSION: 3.29.0
       - DOCKER_TAG: beta
-        FLUTTER_VERSION: 3.28.0-0.1.pre
+        FLUTTER_VERSION: 3.29.0-0.3.pre
   version_script: docker --version
   setup_script:
     - docker buildx create --name multibuilder