Bump python-telegram-bot from 13.7 to 13.8.1

Bumps [python-telegram-bot](https://github.com/python-telegram-bot/python-telegram-bot) from 13.7 to 13.8.1.
- [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](https://github.com/python-telegram-bot/python-telegram-bot/compare/v13.7...v13.8.1)

---
updated-dependencies:
- dependency-name: python-telegram-bot
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -7,7 +7,7 @@ ccxt==1.60.68
 cryptography==35.0.0
 aiohttp==3.7.4.post0
 SQLAlchemy==1.4.27
-python-telegram-bot==13.7
+python-telegram-bot==13.8.1
 arrow==1.2.1
 cachetools==4.2.2
 requests==2.26.0