CI: run macOS GitHub Actions on macOS 13 on amd64

actions/setup-python do not support Python 3.7 on macOS on arm64. The
latest macOS version available is macOS 14 but it is arm64 only. Stick
to macos-13 as long as we want to test Python 3.7 on macOS. macOS 14
on arm64 is covered by the Cirrus CI jobs.

Author: dnicolodi

.github/workflows/tests.yml

@@ -36,14 +36,19 @@ concurrency:
 
 jobs:
   test:
-    runs-on: ${{ matrix.os }}-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         os:
-          - ubuntu
-          - macos
-          - windows
+          - ubuntu-latest
+          # actions/setup-python do not support Python 3.7 on macOS on
+          # arm64. The latest macOS version available is macOS 14 but
+          # it is arm64 only. Stick to macos-13 as long as we want to
+          # test Python 3.7 on macOS. macOS 14 on arm64 is covered by
+          # the Cirrus CI jobs.
+          - macos-13
+          - windows-latest
         python:
           - '3.7'
           - '3.12'
@@ -52,46 +57,46 @@ jobs:
         pyproject_metadata:
           -
         include:
-          - os: ubuntu
+          - os: ubuntu-latest
             python: 'pypy-3.9'
-          - os: ubuntu
+          - os: ubuntu-latest
             python: 'pypy-3.10'
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.8'
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.9'
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.10'
           # Test with older supported Meson version.  Meson up to
           # version 1.2.3 requires distutils, which has been removed
           # from the stdlib in Python 3.12, thus test with Pythn 3.11.
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.11'
             meson: '~=0.63.3'
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.11'
             meson: '~=0.64.0'
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.11'
             meson: '~=1.0.0'
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.11'
             meson: '~=1.1.0'
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.12'
             meson: '~=1.2.3'
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.12'
             meson: '~=1.3'
           # Test with Meson master branch.
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.12'
             meson: '@git+https://github.com/mesonbuild/meson.git'
-          - os: windows
+          - os: windows-latest
             python: '3.12'
             meson: '@git+https://github.com/mesonbuild/meson.git'
           # Test with oldest supported pyproject-metadata
-          - os: ubuntu
+          - os: ubuntu-latest
             python: '3.12'
             pyproject_metadata: '==0.7.1'
 
@@ -106,15 +111,15 @@ jobs:
 
       - name: Install Ninja
         run: sudo apt-get install ninja-build
-        if: ${{ matrix.os == 'ubuntu' }}
+        if: ${{ runner.os == 'Linux' }}
 
       - name: Install Ninja
         run: brew install ninja
-        if: ${{ matrix.os == 'macos' }}
+        if: ${{ runner.os == 'macOS' }}
 
       - name: Install Ninja
         run: python -m pip install ninja
-        if: ${{ matrix.os == 'windows' }}
+        if: ${{ runner.os == 'Windows' }}
 
       - name: Install Meson
         run: python -m pip install "meson ${{ matrix.meson }}"