ci: Use macos-latest version for MacOS

Author: hyperupcall

.github/workflows/ci.yml

@@ -60,7 +60,7 @@ jobs:
  strategy:
  fail-fast: false
  matrix:
- os: ['macos-10.15'] # macos-10.15, macos-11, macos-latest
+ os: ['macos-latest']
 
  runs-on: '${{ matrix.os }}'