Bump redis from 4.8.0 to 4.8.1 (#202)

Bumps [redis](https://github.com/redis/redis-rb) from 4.8.0 to 4.8.1.
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](redis/redis-rb@v4.8.0...v4.8.1)

---
updated-dependencies:
- dependency-name: redis
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Gemfile

@@ -10,7 +10,7 @@ group :development do
   gem 'debug'
   gem 'fakeredis', '~> 0.9'
   gem 'rake', '~> 13.0'
-  gem 'redis', '~> 4.1'
+  gem 'redis', '~> 4.8'
   gem 'rspec', '~> 3.11'
   gem 'rubocop', '~> 1.0.0'
   gem 'simplecov', '~> 0.22'

Gemfile.lock

@@ -28,7 +28,7 @@ GEM
       ast (~> 2.4.1)
     rainbow (3.1.1)
     rake (13.0.6)
-    redis (4.8.0)
+    redis (4.8.1)
     redlock (1.3.2)
       redis (>= 3.0.0, < 6.0)
     regexp_parser (2.6.1)
@@ -79,7 +79,7 @@ DEPENDENCIES
   debug
   fakeredis (~> 0.9)
   rake (~> 13.0)
-  redis (~> 4.1)
+  redis (~> 4.8)
   rspec (~> 3.11)
   rubocop (~> 1.0.0)
   simplecov (~> 0.22)