Bump pillow from 5.3.0 to 12.1.1 in /src

Bumps [pillow](https://github.com/python-pillow/Pillow) from 5.3.0 to 12.1.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@5.3.0...12.1.1)

---
updated-dependencies:
- dependency-name: pillow
  dependency-version: 12.1.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

src/requirements-win.txt

@@ -1,6 +1,6 @@
 pywin32==223
 numpy==1.14.5
-Pillow==5.3.0
+Pillow==12.1.1
 feedparser==5.2.1
 html2text==2018.1.9
 imageio==2.4.1

src/requirements.txt

@@ -1,5 +1,5 @@
 numpy==1.14.5
-Pillow==5.3.0
+Pillow==12.1.1
 feedparser==5.2.1
 html2text==2018.1.9
 imageio==2.4.1