Update redis requirement from ~> 4 to ~> 5

Updates the requirements on [redis](https://github.com/redis/redis-rb) to permit the latest version.
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](redis/redis-rb@v4.8.1...v5.0.8)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -1,12 +1,13 @@
 PATH
   remote: .
   specs:
-    network_resiliency (0.5.0)
+    network_resiliency (0.0.1)
 
 GEM
   remote: https://rubygems.org/
   specs:
     byebug (11.1.3)
+    connection_pool (2.4.1)
     datadog-ci (0.2.0)
       msgpack
     ddtrace (1.15.0)
@@ -53,7 +54,10 @@ GEM
     rack (3.0.8)
     rack-test (2.1.0)
       rack (>= 1.3)
-    redis (4.8.1)
+    redis (5.0.8)
+      redis-client (>= 0.17.0)
+    redis-client (0.18.0)
+      connection_pool
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -89,7 +93,7 @@ DEPENDENCIES
   pg (~> 1.1)
   rack
   rack-test
-  redis (~> 4)
+  redis (~> 5)
   rspec
   simplecov
 

network_resiliency.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "pg", "~> 1.1"
   s.add_development_dependency "rack"
   s.add_development_dependency "rack-test"
-  s.add_development_dependency "redis", "~> 4"
+  s.add_development_dependency "redis", "~> 5"
   s.add_development_dependency "rspec"
   s.add_development_dependency "simplecov"
 end