Drop depenency on base64

http.gemspec

@@ -28,7 +28,6 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = ">= 3.0"
 
   gem.add_runtime_dependency "addressable",    "~> 2.8"
-  gem.add_runtime_dependency "base64",         "~> 0.1"
   gem.add_runtime_dependency "http-cookie",    "~> 1.0"
   gem.add_runtime_dependency "http-form_data", "~> 2.2"
   gem.add_runtime_dependency "llhttp-ffi",     "~> 0.5.0"

lib/http/chainable.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "base64"
-
 require "http/headers"
 
 module HTTP
@@ -213,9 +211,9 @@ def auth(value)
     def basic_auth(opts)
       user  = opts.fetch(:user)
       pass  = opts.fetch(:pass)
-      creds = "#{user}:#{pass}"
+      strict_base64_encoded_creds = ["#{user}:#{pass}"].pack("m0")
 
-      auth("Basic #{Base64.strict_encode64(creds)}")
+      auth("Basic #{strict_base64_encoded_creds}")
     end
 
     # Get options for HTTP

lib/http/request.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require "forwardable"
-require "base64"
 require "time"
 
 require "http/errors"
@@ -159,8 +158,8 @@ def include_proxy_authorization_header
     end
 
     def proxy_authorization_header
-      digest = Base64.strict_encode64("#{proxy[:proxy_username]}:#{proxy[:proxy_password]}")
-      "Basic #{digest}"
+      strict_base64_encoded_digest = ["#{proxy[:proxy_username]}:#{proxy[:proxy_password]}"].pack("m0")
+      "Basic #{strict_base64_encoded_digest}"
     end
 
     # Setup tunnel through proxy for SSL request