.github/workflows/ci-macos.yml: Update tested macos versions, remove …

…test of outdated python from python.org

.github/workflows/ci-macos.yml

@@ -42,12 +42,8 @@ jobs:
         # python3_xcode is only accepted if enough packages are available from the system
         # --> to test "minimal", we would need https://trac.sagemath.org/ticket/30949
         tox_env: [homebrew-macos-usrlocal-minimal, homebrew-macos-usrlocal-standard, homebrew-macos-usrlocal-maximal, homebrew-macos-usrlocal-python3_xcode-standard, conda-forge-macos-minimal, conda-forge-macos-standard, conda-forge-macos-maximal]
-        # As of 2021-12, default xcode
-        # - on macos-10.15:               12.4
-        # - on macos-latest (= macos-11): 13.1
-        # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-10.15-Readme.md#xcode
         xcode_version_factor: [default]
-        os: [ macos-10.15, macos-latest ]
+        os: [ macos-11, macos-12 ]
     env:
       TOX_ENV: local-${{ matrix.tox_env }}
       LOCAL_ARTIFACT_NAME: sage-local-commit-${{ github.sha }}-tox-local-${{ matrix.tox_env }}-${{ matrix.os }}-xcode_${{ matrix.xcode_version_factor }}
@@ -158,22 +154,10 @@ jobs:
       fail-fast: false
       max-parallel: 4
       matrix:
-        os: [ macos-10.15, macos-11.0 ]
-        tox_system_factor: [macos-nobootstrap, macos-nobootstrap-python3_pythonorg]
+        os: [ macos-11, macos-12 ]
+        tox_system_factor: [macos-nobootstrap]
         tox_packages_factor: [minimal]
-        # As of 2021-03, default is 12.4
-        # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-10.15-Readme.md#xcode
         xcode_version_factor: [default]
-        include:
-          # Test xcode 11.7 only on macos-10.15
-          - tox_system_factor: macos-nobootstrap
-            tox_packages_factor: minimal
-            xcode_version_factor: 11.7
-            os: macos-10.15
-          - tox_system_factor: macos-nobootstrap-python3_pythonorg
-            tox_packages_factor: minimal
-            xcode_version_factor: 11.7
-            os: macos-10.15
     env:
       TOX_ENV: local-${{ matrix.tox_system_factor }}-${{ matrix.tox_packages_factor }}
       LOGS_ARTIFACT_NAME: logs-commit-${{ github.sha }}-tox-local-${{ matrix.tox_system_factor }}-${{ matrix.tox_packages_factor }}-xcode_${{ matrix.xcode_version_factor }}
@@ -198,13 +182,6 @@ jobs:
       - name: Install test prerequisites
         run: |
           sudo /usr/bin/python3 -m pip install tox
-      - name: Install python3 from python.org
-        # As of 2020-03-30 (https://github.com/actions/virtual-environments/blob/master/images/macos/macos-10.15-Readme.md),
-        # Python 3.7.7 is installed on GitHub Actions runners.  But we install our own copy from the python.org binary package.
-        run: |
-          curl -o python3.pkg https://www.python.org/ftp/python/3.7.7/python-3.7.7-macosx10.9.pkg
-          sudo installer -verbose -pkg python3.pkg -target /
-        if: contains(matrix.tox_system_factor, 'python3_pythonorg')
       - name: Build and test with tox
         # We use a high parallelization on purpose in order to catch possible parallelization bugs in the build scripts.
         # For doctesting, we use a lower parallelization to avoid timeouts.