GitHub Actions: test on windows-2022 and macos-11.

Author: greenrobot-team

.github/workflows/dart.yml

@@ -37,8 +37,8 @@ jobs:
       fail-fast: false # To see all Dart SDKs that fail, also sometimes with more helpful errors.
       matrix:
         os:
-          - windows-2019
-          - macos-10.15
+          - windows-2022
+          - macos-11
           - ubuntu-20.04
         sdk:
           - stable
@@ -87,8 +87,8 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - windows-2019
-          - macos-10.15
+          - windows-2022
+          - macos-11
           - ubuntu-20.04
         channel:
           - beta