Simplify CI configuration

Using tox environment 'py' means to use whatever Python it finds on PATH.

Author: nicoddemus

.github/workflows/test.yml

@@ -31,62 +31,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        name: [
-          "windows-py38",
-          "windows-py39",
-          "windows-py310",
-          "windows-py311",
-          "windows-py312",
-
-          "ubuntu-py38",
-          "ubuntu-py39",
-          "ubuntu-py310",
-          "ubuntu-py311",
-          "ubuntu-py312",
-        ]
-
-        include:
-          - name: "windows-py38"
-            python: "3.8"
-            os: windows-latest
-            tox_env: "py38"
-          - name: "windows-py39"
-            python: "3.9"
-            os: windows-latest
-            tox_env: "py39"
-          - name: "windows-py310"
-            python: "3.10"
-            os: windows-latest
-            tox_env: "py310"
-          - name: "windows-py311"
-            python: "3.11"
-            os: windows-latest
-            tox_env: "py311"
-          - name: "windows-py312"
-            python: "3.12"
-            os: windows-latest
-            tox_env: "py312"
-
-          - name: "ubuntu-py38"
-            python: "3.8"
-            os: ubuntu-latest
-            tox_env: "py38"
-          - name: "ubuntu-py39"
-            python: "3.9"
-            os: ubuntu-latest
-            tox_env: "py39"
-          - name: "ubuntu-py310"
-            python: "3.10"
-            os: ubuntu-latest
-            tox_env: "py310"
-          - name: "ubuntu-py311"
-            python: "3.11"
-            os: ubuntu-latest
-            tox_env: "py311"
-          - name: "ubuntu-py312"
-            python: "3.12"
-            os: ubuntu-latest
-            tox_env: "py312"
+        os: ["ubuntu-latest", "windows-latest"]
+        python: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v3
@@ -110,4 +56,4 @@ jobs:
     - name: Test
       shell: bash
       run: |
-        tox run -e ${{ matrix.tox_env }} --installpkg `find dist/*.tar.gz`
+        tox run -e py --installpkg `find dist/*.tar.gz`