ci: add Python 3.14 to matrix testing

Author: joanise

.github/workflows/matrix-tests.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v6