feat: add testing on Python 3.14 (#1130)

Author: ngoldbaum

.github/workflows/tests.yml

@@ -61,6 +61,8 @@ jobs:
           - "3.12"
           - "3.13"
           - "3.13t"
+          - "3.14"
+          - "3.14t"
           - "pypy-3.9"
         exclude:
           - os:
@@ -78,6 +80,7 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python }}
+          allow-prereleases: true
           cache: pip
 
       - name: Install dependencies