Bump rack from 3.1.8 to 3.1.12

run tests - RUBY_VERSION=3.1.6

run tests - RUBY_VERSION=3.2.7

run tests - RUBY_VERSION=3.3.7

run tests - RUBY_VERSION=3.4.1

run tests - RUBY_VERSION=jruby-9.4.12.0

run tests - RUBY_VERSION=truffleruby-24.1.2

macos matrix test - RUBY_VERSION=3.1.6

macos matrix test - RUBY_VERSION=3.2.7

macos matrix test - RUBY_VERSION=3.3.7

macos matrix test - RUBY_VERSION=3.4.1