Bump minimal Ruby version requirement to v3.0

Ruby v2.7 reached EOL on 2023-03-31 [1].

This also fixes testing against Solidus master, which also dropped Ruby
2.7 support [2].

[1] - https://www.ruby-lang.org/en/downloads/branches/
[2] - solidusio/solidus#5012

.circleci/config.yml

@@ -33,26 +33,28 @@ jobs:
   run-specs-with-postgres:
     executor:
       name: solidusio_extensions/postgres
-      ruby_version: '3.1'
+      ruby_version: '3.2'
     steps:
       - test-with-starter-frontend
 
   run-specs-with-mysql:
     executor:
       name: solidusio_extensions/mysql
-      ruby_version: '3.0'
+      ruby_version: '3.1'
     steps:
       - test-with-starter-frontend
 
   run-specs-with-sqlite:
     executor:
       name: solidusio_extensions/sqlite
-      ruby_version: '2.7'
+      ruby_version: '3.0'
     steps:
       - test-with-starter-frontend
 
   lint-code:
-    executor: solidusio_extensions/sqlite-memory
+    executor:
+      name: solidusio_extensions/sqlite-memory
+      ruby_version: '3.0'
     steps:
       - solidusio_extensions/lint-code
 

.rubocop.yml

@@ -3,7 +3,7 @@ require:
 
 AllCops:
   NewCops: disable
-  TargetRubyVersion: '2.7'
+  TargetRubyVersion: '3.0'
   Exclude:
     - sandbox/**/*
     - dummy-app/**/*

solidus_paypal_commerce_platform.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |spec|
   spec.metadata['changelog_uri'] = 'https://github.com/solidusio/solidus_paypal_commerce_platform/releases'
   spec.metadata['rubygems_mfa_required'] = 'true'
 
-  spec.required_ruby_version = Gem::Requirement.new('>= 2.7')
+  spec.required_ruby_version = Gem::Requirement.new('>= 3.0')
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.