Test on Python 3.14 release candidate 2 and on macOS 26

Author: cclauss

.github/workflows/tox.yml

@@ -14,19 +14,21 @@ on:
 jobs:
   tests:
     strategy:
+      fail-fast: false
       matrix:
         os: [ macos-latest ]
-        python-version: [ '3.10', '3.11', '3.12', '3.13' ]
+        python-version: [ '3.10', '3.11', '3.12', '3.13', '3.14' ]
         include:
           - os: macos-26
             python-version: 3.x
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python V${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+      - uses: actions/checkout@v5
+      - name: Set up Python v${{ matrix.python-version }}
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
       - name: Install tox-gh-actions
         run: |
           python -m pip install --upgrade pip