Bump pillow from 8.2.0 to 9.0.0 in /chatbots/ml_bot

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.2.0 to 9.0.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.2.0...9.0.0)

---
updated-dependencies:
- dependency-name: pillow
  dependency-type: direct:production
...

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

Author: dependabot[bot]

chatbots/ml_bot/requirements.txt

@@ -12,7 +12,7 @@ matplotlib==3.4.2
 networkx==2.5.1
 nltk==3.6.2
 numpy==1.20.3
-Pillow==8.2.0
+Pillow==9.0.0
 pydub==0.25.1
 pyparsing==2.4.7
 pyTelegramBotAPI==3.7.9