build(deps): bump redis to 8.0.0 in search-api

Bumps [redis](https://github.com/redis/redis-py) from 6.4.0 to 8.0.0.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v6.4.0...v8.0.0)

---
updated-dependencies:
- dependency-name: redis
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

search-api/requirements.txt

@@ -6,7 +6,7 @@ joblib==1.5.3
 numpy==2.4.6
 psycopg2-binary==2.9.10
 requests==2.33.1
-redis==6.4.0
+redis==8.0.0
 scikit-learn==1.7.1
 sentence-transformers==5.4.1
 transformers==5.8.0