fix: Add base64 dependency

Author: rhatherall

cognito_idp-client.gemspec

@@ -30,6 +30,7 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
+  spec.add_dependency "base64"
   spec.add_dependency "faraday", "~> 2.7"
 
   # For more information and examples about making a new gem, check out our

lib/cognito_idp/client.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "base64"
 require "faraday"
 
 module CognitoIdp