ci: disable macos, as it's broken on the latest version of macos

Author: pieleric

.github/workflows/ci.yaml

@@ -39,7 +39,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        os: ["windows-latest", "ubuntu-latest", "macos-latest"]
+        os: ["windows-latest", "ubuntu-latest"] #, "macos-latest"]
         python-version: ["3.8", "3.9", "3.10"]
         experimental: [false]
         system-libtiff: [false]