build: scrap macos tests

they are too slow

Author: matfax

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         python-version: [3.7, 3.8]
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, windows-latest]
     defaults:
       run:
         shell: bash