ci: disable macos-latest

Because we don't have Homebrew formulae for ADBC yet.

Author: kou

.github/workflows/test.yaml

@@ -15,7 +15,7 @@ jobs:
           - "3.1"
           - "3.2"
         runs-on:
-          - macos-latest
+          # - macos-latest
           - ubuntu-latest
           # - windows-latest
     runs-on: ${{ matrix.runs-on }}