Bump pillow from 7.2.0 to 9.0.1 in /solarpos/app

Bumps [pillow](https://github.com/python-pillow/Pillow) from 7.2.0 to 9.0.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@7.2.0...9.0.1)

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

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

Author: dependabot[bot]

solarpos/app/requirements.txt

@@ -16,7 +16,7 @@ kiwisolver==1.2.0
 MarkupSafe==1.1.1
 matplotlib==3.3.2
 numpy==1.19.2
-Pillow==7.2.0
+Pillow==9.0.1
 pipdeptree==1.0.0
 pyjsparser==2.7.1
 pyparsing==2.4.7