chore: remove actix-redis crate

[robjtede]

PR Type

Crate deletion.

PR Checklist

• [x] Tests for the changes have been added / updated.
• [x] Documentation comments have been added / updated.
• [x] A changelog entry has been made for the appropriate packages.
• [x] Format code with the nightly rustfmt (cargo +nightly fmt).

Overview

I don't think actix-redis is worth maintaining any more.