Fix "method redefined" warnings introduced in Faraday 2.7.5 (#1506)

* Print Ruby warnings when running specs

* Fix 'method redefined' warnings

Rakefile

@@ -2,6 +2,8 @@
 
 require 'rspec/core/rake_task'
 
-RSpec::Core::RakeTask.new(:spec)
+RSpec::Core::RakeTask.new(:spec) do |task|
+  task.ruby_opts = %w[-W]
+end
 
 task default: :spec

lib/faraday/options.rb

@@ -174,6 +174,7 @@ module Faraday
 
       memoized_attributes[key.to_sym] = block
       class_eval <<-RUBY, __FILE__, __LINE__ + 1
+        remove_method(key) if method_defined?(key, false)
         def #{key}() self[:#{key}]; end
       RUBY
     end

lib/faraday/request.rb

@@ -42,6 +42,7 @@ module Faraday
       end
     end
 
+    remove_method :params=
     # Replace params, preserving the existing hash type.
     #
     # @param hash [Hash] new params
@@ -53,6 +54,7 @@ module Faraday
       end
     end
 
+    remove_method :headers=
     # Replace request headers, preserving the existing hash type.
     #
     # @param hash [Hash] new headers

lib/faraday/request/instrumentation.rb

@@ -6,11 +6,13 @@ module Faraday
     class Instrumentation < Faraday::Middleware
       # Options class used in Request::Instrumentation class.
       Options = Faraday::Options.new(:name, :instrumenter) do
+        remove_method :name
         # @return [String]
         def name
           self[:name] ||= 'request.faraday'
         end
 
+        remove_method :instrumenter
         # @return [Class]
         def instrumenter
           self[:instrumenter] ||= ActiveSupport::Notifications