Release version 2.1.1

Connection Pool for Redis (#448)

* Connection Pool for Redis

* Removed comments

* Using Stealth::RedisSupport instead of $redis

* Added bigdecimal for ruby >= 3.4

* Removed pry gems

* Removed pry gems

* Added bigdecimal

* Added mutex_m gem

* Updated Gemfile.lock

* Updated CI

* Removed unnecessary gems

* Updated redis gem version

* Update CI truffleruby-head to truffleruby

Prepare 2.0.0.beta4 (#302)

Prepare 2.0.0.beta3 (#294)

* Update gems

* Prepare 2.0.0.beta3

Prepare 2.0.0.beta2

Prepare 2.0.0.beta1

Prepare v1.1.6

Prepare 1.1.5

Prepare 1.1.4

Prepare 1.1.3