Add Python 3.14 to CI test matrix

Author: ThomasMalletCodra

.github/workflows/test_pyqt5.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.13"]
+        python-version: ["3.9", "3.13", "3.14"]
 
     steps:
     - uses: actions/checkout@v4