💥 Bump ruby version requirement to 3.0+

* ruby 3.0.0 was released 2020-12-25, and 3.0.7/EOL was 2024-04-23.
* ruby 3.1.0 was released 2021-12-25, and 3.1.7/EOL was 2025-03-26.

This matches the latest `resque` gem's release, which just bumped _its_
minumum required ruby to 3.0.

Author: nevans

.github/workflows/ruby.yml

@@ -18,10 +18,6 @@ jobs:
         os:
           - ubuntu-24.04
         ruby:
-          - "2.4"
-          - "2.5"
-          - "2.6"
-          - "2.7"
           - "3.0"
           - "3.1"
           - "3.2"
@@ -46,17 +42,6 @@ jobs:
           - { resque: "2.7",  redis: "5.4" }
           - { resque: "3.0",  redis: "5.4" }
 
-        exclude:
-          - { resque: "2.5", ruby: "2.4" } # redis 5.0 requires ruby 2.5
-          - { resque: "2.6", ruby: "2.4" } # redis 5.2 requires ruby 2.6
-          - { resque: "2.6", ruby: "2.5" } # redis 5.2 requires ruby 2.6
-          - { resque: "2.7", ruby: "2.4" } # redis 5.2 requires ruby 2.6
-          - { resque: "2.7", ruby: "2.5" } # redis 5.2 requires ruby 2.6
-          - { resque: "3.0", ruby: "2.4" } # resque 3.0 requires ruby 3.0
-          - { resque: "3.0", ruby: "2.5" } # resque 3.0 requires ruby 3.0
-          - { resque: "3.0", ruby: "2.6" } # resque 3.0 requires ruby 3.0
-          - { resque: "3.0", ruby: "2.7" } # resque 3.0 requires ruby 3.0
-
     services:
       redis:
         image: redis

resque-pool.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = '>= 2.0'
+  spec.required_ruby_version = '>= 3.0'
 
   spec.add_dependency "resque", ">= 2.2", "< 4"
   spec.add_dependency "rake",   ">= 10.0"