Bump the pip group across 1 directory with 3 updates

Bumps the pip group with 3 updates in the /requirements directory: [djangorestframework](https://github.com/encode/django-rest-framework), [pillow](https://github.com/python-pillow/Pillow) and [black](https://github.com/psf/black).


Updates `djangorestframework` from 3.17.2 to 3.18.2
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](https://github.com/encode/django-rest-framework/compare/3.17.2...3.18.2)

Updates `pillow` from 12.3.0 to 13.0.0
- [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/12.3.0...13.0.0)

Updates `black` from 26.3.1 to 26.10.1
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/compare/26.3.1...26.10.1)

---
updated-dependencies:
- dependency-name: djangorestframework
  dependency-version: 3.18.2
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: pillow
  dependency-version: 13.0.0
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: black
  dependency-version: 26.10.1
  dependency-type: direct:development
  dependency-group: pip
...

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

requirements/dev-requirements.txt

@@ -1,4 +1,4 @@
 -r requirements.txt
-black==26.3.1
+black==26.10.1
 ipdb==0.13.13
 pygraphviz==1.14

requirements/requirements.txt

@@ -10,7 +10,7 @@ django-import-export[all]==4.4.0
 django-localflavor==5.0
 django-tinymce==5.0.0
 django-weasyprint==2.5.0
-djangorestframework==3.17.2
+djangorestframework==3.18.2
 dnspython==2.8.0
 docutils==0.22.4
 drf-spectacular==0.29.0
@@ -24,7 +24,7 @@ moodlepy==0.24.1
 odfpy==1.4.1
 pandas==3.0.2
 parsel==1.11.0
-pillow==12.3.0
+pillow==13.0.0
 psycopg2-binary==2.9.12
 python-docx==1.2.0
 python-magic==0.4.27