Update python-telegram-bot requirement from ~=21.5 to ~=21.6

Updates the requirements on [python-telegram-bot](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@v21.5...v21.6)

---
updated-dependencies:
- dependency-name: python-telegram-bot
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -12,7 +12,7 @@ mini-racer~=0.12.4
 numpy>=1.22.4
 Pillow~=10.4.0
 pyoxipng~=9.0.0
-python-telegram-bot~=21.5
+python-telegram-bot~=21.6
 psutil~=6.0.0
 PyMemoryEditor~=1.5.22
 requests~=2.32.3