Require Ruby 3+

Ruby 2.7 reached EoL in March 2023. It's time to drop support since our
CI is now complaining about Bundler not supporting Ruby < 3.

.github/workflows/lint.yml

@@ -14,9 +14,9 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@v1.97.0
+        uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7
+          ruby-version: 3.3
 
       - name: Install dependencies
         run: bundle install

README.md

@@ -10,7 +10,7 @@ for use in tests.
 
 ## Requirements
 
-Ruby 2.7+
+Ruby 3.0+
 
 The current implementation is tested against Redis 6.2. Older versions may work, but can also return different results or not support some commands.
 

mock_redis.gemspec

@@ -32,7 +32,7 @@ Gem::Specification.new do |s|
 
   s.require_paths = ['lib']
 
-  s.required_ruby_version = '>= 2.7'
+  s.required_ruby_version = '>= 3.0'
 
   s.add_development_dependency 'rake', '~> 13'
   s.add_development_dependency 'redis', '~> 4.8.0'