Sync serverless-sms-service with the updated tutorial

[realpython-bot]

Maintenance sync for Building Serverless Python Apps Using AWS Chalice.

What changed and why

• requirements.txt: twilio==6.18.1 -> twilio==9.11.2, matching the article's updated pin (the deployment requirement Lambda installs).
• requirements-dev.txt: replaced the 2018 freeze (chalice 1.6.0, typing==3.6.4, enum-compat, ...) with a fresh freeze of chalice==1.33.0 on Python 3.14. Current Chalice requires Python >= 3.10, and the old pins don't install on supported Lambda runtimes.
• Code unchanged: app.py and chalicelib/sms.py already match the article's code and house style.

Links

• Draft (update clone): https://realpython.com/pbjt/blog/post/2449/change/
• Maintenance card: https://trello.com/c/Wn8PmxGZ

Verification

• Fresh Python 3.14.6 venv from requirements.txt + requirements-dev.txt.
• chalice.test.Client smoke test: GET / -> 200 {"hello": "world"}; POST /service/sms/send with dummy credentials -> 400 via the TwilioRestException handler (Twilio 9.x API path exercised end to end).
• chalice package builds deployment.zip + sam.json (runtime python3.14).
• ruff@0.14.1 format --check and ruff check pass.

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