Python dependency: Update pillow requirement in /web/regression

Updates the requirements on [pillow](https://github.com/python-pillow/Pillow) to permit the latest version.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@9.0.0...10.0.0)

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

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

requirements.txt

@@ -42,7 +42,7 @@ pywinpty==2.0.*; sys_platform=="win32"
 Authlib==1.2.*
 pyotp==2.*
 qrcode==7.*
-Pillow==9.*
+Pillow==10.*
 boto3==1.28.*
 botocore==1.31.*
 urllib3==1.26.*