chore: migrate away from deprecated JSON#fast_generate

Author: stainless-app[bot]

Rakefile

@@ -31,7 +31,7 @@ multitask(:test) do
     .map { "require_relative(#{_1.dump});" }
     .join
 
-  ruby(*%w[-e], rb, verbose: false) { fail unless _1 }
+  ruby(*%w[-w -e], rb, verbose: false) { fail unless _1 }
 end
 
 rubo_find = %w[find ./lib ./test ./rbi -type f -and ( -name *.rb -or -name *.rbi ) -print0]

lib/orb/internal/util.rb

@@ -493,7 +493,7 @@ class << self
             y << val.to_s
           else
             y << "Content-Type: application/json\r\n\r\n"
-            y << JSON.fast_generate(val)
+            y << JSON.generate(val)
           end
           y << "\r\n"
         end
@@ -570,9 +570,9 @@ def encode_content(headers, body)
           content_type = headers["content-type"]
           case [content_type, body]
           in [Orb::Internal::Util::JSON_CONTENT, Hash | Array | -> { primitive?(_1) }]
-            [headers, JSON.fast_generate(body)]
+            [headers, JSON.generate(body)]
           in [Orb::Internal::Util::JSONL_CONTENT, Enumerable] unless body.is_a?(Orb::Internal::Type::FileInput)
-            [headers, body.lazy.map { JSON.fast_generate(_1) }]
+            [headers, body.lazy.map { JSON.generate(_1) }]
           in [%r{^multipart/form-data}, Hash | Orb::Internal::Type::FileInput]
             boundary, strio = encode_multipart_streaming(body)
             headers = {**headers, "content-type" => "#{content_type}; boundary=#{boundary}"}