Run the tests on the Python that Home Assistant requires

The suite imports Home Assistant now, and 2026.8 needs Python 3.14.2, so the
3.13 runner could not install it at all.

Author: cgehring-blip

.github/workflows/validate.yml

@@ -30,7 +30,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.13"
+          python-version: "3.14"
       - run: pip install -r requirements_test.txt
       - run: python -m pytest tests/ -q
 
@@ -41,7 +41,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.13"
+          python-version: "3.14"
       - run: pip install ruff
       # F821 catches a name used but never imported, which is exactly what
       # slipped through into a release and only surfaced as a runtime error