chore: Align Ruby version support with Rails main requirements

- Update minimum Ruby version to 3.3 (Rails main requires >= 3.3.0)
- Remove Ruby 3.0, 3.1, 3.2 from CI matrix (EOL or nearing EOL)
- Keep Ruby 3.3, 3.4, and 4.0 in CI matrix
- Update README to reflect new requirements

Ruby version support:
- Ruby 3.3: Supported (normal maintenance until 2027)
- Ruby 3.4: Supported (latest stable, released Dec 2024)
- Ruby 4.0: Supported (latest major version, released Dec 2025)

This ensures compatibility with Rails main and focuses on actively maintained Ruby versions.

Author: vipulnsward

.github/workflows/ruby.yml

@@ -16,9 +16,6 @@ jobs:
     strategy:
       matrix:
         ruby-version:
-          - 3.0
-          - 3.1
-          - 3.2
           - 3.3
           - 3.4
           - 4.0

README.md

@@ -35,7 +35,7 @@ wrapping Upload and REST APIs.
 
 ## Requirements
 
-- ruby 3.0+
+- Ruby 3.3+ (compatible with Rails main)
 
 ## Compatibility
 

uploadcare-ruby.gemspec

@@ -43,7 +43,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '>= 3.0' # Tested with Ruby 3.0 through 4.0
+  spec.required_ruby_version = '>= 3.3' # Compatible with Rails main (requires Ruby 3.3+)
 
   spec.add_dependency 'addressable', '~> 2.8'
   spec.add_dependency 'faraday', '~> 2.12'