ci: use latest macOS

vor 5 Monaten · 3682ed69f9
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -15,7 +15,7 @@ jobs:
      matrix:
        os:
          - ubuntu-latest
          - macos-11.0
          - macos-latest
          - windows-latest
        python_version:
          - '3.8'