Add Python 3.14 to CI workflow matrix

Author: nsano-rururu

.github/workflows/test-and-deploy.yml

@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 20
     strategy:
       matrix:
-        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' ]
     steps:
       - name: Checkout twilio-python
         uses: actions/checkout@v3