CI: test with Flutter 2.2.0 which fixes resolving null safety deps.

Author: greenrobot-team

.github/workflows/dart.yml

@@ -96,7 +96,9 @@ jobs:
           - ubuntu-20.04
         flutter-version:
           - 3.0.0
-          - 2.0.0 # Lowest supported version, based on lowest supported Dart SDK, see pubspec.yaml files
+          - 2.2.0
+          # 2.0.0 technically lowest supported, but need 2.2.0 to correctly resolve null safety dependencies.
+          # https://github.com/flutter/flutter/issues/77282
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2

objectbox/example/flutter/objectbox_demo/pubspec.yaml

@@ -3,8 +3,7 @@ description: An example project for the objectbox-dart binding.
 version: 0.3.0+1
 
 environment:
-  sdk: ^2.12.0
-  flutter: ^2.0.0
+  sdk: ">=2.13.0 <3.0.0"
 
 dependencies:
   flutter:
@@ -32,8 +31,3 @@ dependency_overrides:
     path: ../../../../generator
   objectbox_flutter_libs:
     path: ../../../../flutter_libs
-
-  # Temporary flutter_driver issue, same as https://github.com/flutter/flutter/issues/77282
-  archive: ^3.0.0
-  convert: ^3.0.0
-  crypto: ^3.0.0

objectbox/example/flutter/objectbox_demo_relations/pubspec.yaml

@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.13.0 <3.0.0"
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions

objectbox/example/flutter/objectbox_demo_sync/pubspec.yaml

@@ -3,8 +3,7 @@ description: An example project for the objectbox-dart binding.
 version: 0.3.0+1
 
 environment:
-  sdk: ^2.12.0
-  flutter: ^2.0.0
+  sdk: ">=2.13.0 <3.0.0"
 
 dependencies:
   flutter:
@@ -32,8 +31,3 @@ dependency_overrides:
     path: ../../../../generator
   objectbox_sync_flutter_libs:
     path: ../../../../sync_flutter_libs
-
-  # Temporary flutter_driver issue, same as https://github.com/flutter/flutter/issues/77282
-  archive: ^3.0.0
-  convert: ^3.0.0
-  crypto: ^3.0.0