Update redis requirement from ~=4.0 to ~=5.0

Updates the requirements on [redis](https://github.com/redis/redis-py) to permit the latest version.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v4.0.0...v5.0.0)

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

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

pyproject.toml

@@ -18,7 +18,7 @@ classifiers = [
 ]
 dependencies = [
     "pysolr==3.9.0",
-    "redis~=4.0",
+    "redis~=5.0",
     "simplemma==0.9.1",
     "solrq==1.1.2",
     "SPARQL-Burger~=1.0.0",