CI: increase lowest tested Dart (3.4.4) and Flutter (3.22.3) SDK

Author: greenrobot-team

.github/workflows/test.yml

@@ -68,7 +68,7 @@ jobs:
           # Can not use env variables here, only within 'steps'.
           # For available versions see https://dart.dev/get-dart/archive
           - 3.7.2
-          - 2.18.6 # Use latest bugfix release to get tooling fixes
+          - 3.4.4 # Use latest bugfix release to get tooling fixes
     runs-on: ${{ matrix.os }}
     steps:
       - uses: dart-lang/setup-dart@0a8a0fc875eb934c15d08629302413c671d3f672 # v1.6.5
@@ -111,7 +111,7 @@ jobs:
           # Can not use env variables here, only within 'steps'.
           # For available versions see https://docs.flutter.dev/release/archive
           - 3.29.2
-          - 3.7.12 # Use latest bugfix release to get tooling fixes
+          - 3.22.3 # Use latest bugfix release to get tooling fixes
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0

.gitlab-ci.yml

@@ -6,9 +6,10 @@ stages:
 variables:
   # Test latest available and lowest supported SDK (see dev-doc/updating-dart-flutter-and-dependencies.md).
   # # Pick a concrete version instead of "latest" to avoid builds breaking due to changes in new
-  # SDKs. For available versions see https://hub.docker.com/_/dart?tab=tags
+  # SDKs.
+  # For available versions see https://hub.docker.com/_/dart/tags and https://dart.dev/get-dart/archive
   DART_VERSION_LATEST: '3.7.2'
-  DART_VERSION_LOWEST: '2.18.6' # Use latest bugfix release to get tooling fixes
+  DART_VERSION_LOWEST: '3.4.4' # Use latest bugfix release to get tooling fixes
   DART_VERSION: $DART_VERSION_LATEST # Also used for caching, see .cache template
 
 .common: