Switch MacOS jobs to the most supported version.

Author: HexDecimal

.github/workflows/python-package-macos.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: ['macos-11.0']
+        os: ['macos-latest']
         python-version: ['3.7.9']
 
     steps:
@@ -77,8 +77,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: ['macos-11.0']
-        python-version: ['3.7.9']
+        os: ['macos-latest']
+        python-version: ['3.x']
     steps:
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2