Bump ruby requirement to >= 2.7

.rubocop.yml

@@ -2,7 +2,7 @@ require: rubocop-performance
 AllCops:
   NewCops: enable
   SuggestExtensions: false
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.7
   Exclude:
   - '*.gemspec'
   - 'vendor/**/*'

README.md

@@ -25,8 +25,7 @@
 ## Prerequisites
 
 - (Optional but highly recommended: [RVM](https://rvm.io/rvm/install))
-- Ruby >= 2.5 - Recommended: latest
-  - Ruby 2.5.0 to 2.5.3 can cause an 'undefined symbol: rmpd_util_str_to_d' error in some systems, see [#1283](https://github.com/wpscanteam/wpscan/issues/1283)
+- Ruby >= 2.7 - Recommended: latest
 - Curl >= 7.72  - Recommended: latest
   - The 7.29 has a segfault
   - The < 7.72 could result in `Stream error in the HTTP/2 framing layer` in some cases

wpscan.gemspec

@@ -7,7 +7,7 @@ Gem::Specification.new do |s|
   s.name                  = 'wpscan'
   s.version               = WPScan::VERSION
   s.platform              = Gem::Platform::RUBY
-  s.required_ruby_version = '>= 2.5'
+  s.required_ruby_version = '>= 2.7'
   s.authors               = ['WPScanTeam']
   s.email                 = ['contact@wpscan.com']
   s.summary               = 'WPScan - WordPress Vulnerability Scanner'