Bump pillow from 9.1.0 to 9.1.1 in /binder

Bumps [pillow](https://github.com/python-pillow/Pillow) from 9.1.0 to 9.1.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](https://github.com/python-pillow/Pillow/compare/9.1.0...9.1.1)

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

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

binder/requirements.txt

@@ -5,7 +5,7 @@ imageio==2.16.2
 keras==2.8.0
 nltk==3.5
 pandas==1.4.2
-pillow==9.1.0
+pillow==9.1.1
 pygame==2.1.2
 scikit-image==0.19.2
 seaborn==0.11.2