chore: upgrade to Ruby SDK v4 (#5)

Author: fahad19

Gemfile

@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 ruby '>= 3.0.0'
 
 # Add your gems here
-gem 'featurevisor', '~> 3.0'
+gem 'featurevisor', '~> 4.0'
 gem 'rake', '~> 13.0'
 
 group :development do

Gemfile.lock

@@ -3,7 +3,7 @@ GEM
   specs:
     ast (2.4.3)
     benchmark (0.5.0)
-    featurevisor (3.0.0)
+    featurevisor (4.0.0)
       benchmark (>= 0, < 1)
     json (2.21.1)
     language_server-protocol (3.17.0.6)
@@ -41,7 +41,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  featurevisor (~> 3.0)
+  featurevisor (~> 4.0)
   rake (~> 13.0)
   rubocop (~> 1.50)