Bump pillow from 8.0.1 to 8.1.1 (#396)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.0.1 to 8.1.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](https://github.com/python-pillow/Pillow/compare/8.0.1...8.1.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -6,7 +6,7 @@ idna==2.10
 Kivy==2.0.0
 Kivy-Garden==0.1.4
 kivymd==0.104.1
-Pillow==8.0.1
+Pillow==8.1.1
 Pygments==2.7.3
 requests==2.25.0
 urllib3==1.26.3