Remove macOS from GH actions

Author: AeonLucid

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ${{ matrix.platform }}
     strategy:
       matrix:
-        platform: [ubuntu-latest, macos-latest, windows-latest]
+        platform: [ubuntu-latest, windows-latest]
         python-version: [3.7, 3.8, 3.9]
     steps:
     - uses: actions/checkout@v2