Bump redis[hiredis] from 5.0.2 to 5.2.1 in /backend

Bumps [redis[hiredis]](https://github.com/redis/redis-py) from 5.0.2 to 5.2.1.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v5.0.2...v5.2.1)

---
updated-dependencies:
- dependency-name: redis[hiredis]
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

backend/pyproject.toml

@@ -43,7 +43,7 @@ known-first-party = [
 
 [project]
 requires-python = "<3.13,>=3.11"
-dependencies = ["django==5.1.1", "django-environ==0.10.0", "django-model-utils==4.5.1", "django-timezone-field==7.0", "certifi==2024.7.4", "chardet==5.2.0", "idna==3.7", "requests==2.32.3", "urllib3==2.2.2", "aniso8601==9.0.1", "whitenoise==6.7.0", "django-ordered-model==3.5", "uWSGI==2.0.26", "django-storages==1.14.4", "sentry-sdk==2.11.0", "boto3==1.35.76", "pycountry<20.0,>=19.8", "countries<1.0.0,>=0.2.0", "django-ses==4.1.1", "hashids<2.0.0,>=1.2.0", "django-autocomplete-light==3.9.4", "django-queryinspect<2.0.0,>=1.1.0", "lxml<5.0.0,>=4.5.0", "unidecode<2.0.0,>=1.1.1", "strawberry-graphql==0.243.1", "Werkzeug<2.0.0,>=1.0.1", "django-import-export<4.0.0,>=3.2.0", "dal-admin-filters==1.1.0", "django-markdownify==0.9.5", "psycopg2==2.9.9", "django-imagekit==5.0.0", "pillow==10.4.0", "redis[hiredis]==5.0.2", "google-api-python-client<3.0.0,>=2.94.0", "google-auth<3.0.0,>=2.22.0", "opencv-python<5.0.0.0,>=4.8.0.74", "argon2-cffi<24.0.0,>=23.1.0", "stripe==10.5.0", "djangorestframework==3.15.2", "l18n<2022.0,>=2021.3", "wagtail==6.2.2", "wagtail-localize==1.10", "celery==5.4.0", "wagtail-headless-preview==0.8.0", "Jinja2>=3.1.3", "icalendar>=5.0.11", "pyclamd>=0.4.0", "magika>=0.5.1", "tzdata>=2024.1", "wagtail-factories==4.2.1", "google-auth-oauthlib>=1.2.1", "PyJWT>=2.8.0", "cryptography>=43.0.0", "openai>=1.52.0", "pydantic>=2.9.2", "gunicorn>=23.0.0", "tinycss2>=1.4.0"]
+dependencies = ["django==5.1.1", "django-environ==0.10.0", "django-model-utils==4.5.1", "django-timezone-field==7.0", "certifi==2024.7.4", "chardet==5.2.0", "idna==3.7", "requests==2.32.3", "urllib3==2.2.2", "aniso8601==9.0.1", "whitenoise==6.7.0", "django-ordered-model==3.5", "uWSGI==2.0.26", "django-storages==1.14.4", "sentry-sdk==2.11.0", "boto3==1.35.76", "pycountry<20.0,>=19.8", "countries<1.0.0,>=0.2.0", "django-ses==4.1.1", "hashids<2.0.0,>=1.2.0", "django-autocomplete-light==3.9.4", "django-queryinspect<2.0.0,>=1.1.0", "lxml<5.0.0,>=4.5.0", "unidecode<2.0.0,>=1.1.1", "strawberry-graphql==0.243.1", "Werkzeug<2.0.0,>=1.0.1", "django-import-export<4.0.0,>=3.2.0", "dal-admin-filters==1.1.0", "django-markdownify==0.9.5", "psycopg2==2.9.9", "django-imagekit==5.0.0", "pillow==10.4.0", "redis[hiredis]==5.2.1", "google-api-python-client<3.0.0,>=2.94.0", "google-auth<3.0.0,>=2.22.0", "opencv-python<5.0.0.0,>=4.8.0.74", "argon2-cffi<24.0.0,>=23.1.0", "stripe==10.5.0", "djangorestframework==3.15.2", "l18n<2022.0,>=2021.3", "wagtail==6.2.2", "wagtail-localize==1.10", "celery==5.4.0", "wagtail-headless-preview==0.8.0", "Jinja2>=3.1.3", "icalendar>=5.0.11", "pyclamd>=0.4.0", "magika>=0.5.1", "tzdata>=2024.1", "wagtail-factories==4.2.1", "google-auth-oauthlib>=1.2.1", "PyJWT>=2.8.0", "cryptography>=43.0.0", "openai>=1.52.0", "pydantic>=2.9.2", "gunicorn>=23.0.0", "tinycss2>=1.4.0"]
 name = "backend"
 version = "0.1.0"
 description = "PyCon Italia backend"