feat: drop ruby v2 (#481)

Author: KazuCocoa

.github/workflows/unittest.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.7, 3.0, 3.1, 3.2]
+        ruby: [3.0, 3.1, 3.2]
 
     runs-on: ubuntu-latest
 
@@ -38,7 +38,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.7, 3.0, 3.1, 3.2]
+        ruby: [3.0, 3.1, 3.2]
 
     runs-on: windows-latest
 

appium_lib_core.gemspec

@@ -4,7 +4,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'appium_lib_core/version'
 
 Gem::Specification.new do |spec|
-  spec.required_ruby_version = Gem::Requirement.new('>= 2.7')
+  spec.required_ruby_version = Gem::Requirement.new('>= 3.0')
 
   spec.name          = 'appium_lib_core'
   spec.version       = Appium::Core::VERSION