Update python-telegram-bot[rate-limiter] requirement

Updates the requirements on [python-telegram-bot[rate-limiter]](https://github.com/python-telegram-bot/python-telegram-bot) to permit the latest version.
- [Release notes](https://github.com/python-telegram-bot/python-telegram-bot/releases)
- [Changelog](https://github.com/python-telegram-bot/python-telegram-bot/blob/master/CHANGES.rst)
- [Commits](python-telegram-bot/python-telegram-bot@v20.7...v21.1.1)

---
updated-dependencies:
- dependency-name: python-telegram-bot[rate-limiter]
  dependency-type: direct:production
...

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requirements.txt

@@ -1,4 +1,4 @@
-python-telegram-bot[rate-limiter]~=20.7
+python-telegram-bot[rate-limiter]~=21.1
 Pillow~=9.5.0
 PyHyphen==4.0.3
 pytz