Fixed typing job not finding Python 3.14

Author: agronholm

.github/workflows/test.yml

@@ -18,6 +18,7 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
+        allow-prereleases: true
     - uses: actions/cache@v4
       with:
         path: ~/.cache/pip