Fix Style/StringLiterals cop (#30005)

config/initializers/backtrace_silencers.rb

@@ -7,4 +7,4 @@
 
 # You can also remove all the silencers if you're trying to debug a problem that might stem from framework code
 # by setting BACKTRACE=1 before calling your invocation, like "BACKTRACE=1 ./bin/rails runner 'MyClass.perform'".
-Rails.backtrace_cleaner.remove_silencers! if ENV["BACKTRACE"]
+Rails.backtrace_cleaner.remove_silencers! if ENV['BACKTRACE']

config/initializers/http_client_proxy.rb

@@ -7,7 +7,7 @@ Rails.application.configure do
     proxy = URI.parse(ENV['http_proxy'])
 
     raise "Unsupported proxy type: #{proxy.scheme}" unless %w(http https).include? proxy.scheme
-    raise "No proxy host" unless proxy.host
+    raise 'No proxy host' unless proxy.host
 
     host = proxy.host
     host = host[1...-1] if host[0] == '[' # for IPv6 address
@@ -24,7 +24,7 @@ Rails.application.configure do
     proxy = URI.parse(ENV['http_hidden_proxy'])
 
     raise "Unsupported proxy type: #{proxy.scheme}" unless %w(http https).include? proxy.scheme
-    raise "No proxy host" unless proxy.host
+    raise 'No proxy host' unless proxy.host
 
     host = proxy.host
     host = host[1...-1] if host[0] == '[' # for IPv6 address

config/initializers/rack_attack.rb

@@ -14,7 +14,7 @@ class Rack::Attack
     end
 
     def remote_ip
-      @remote_ip ||= (@env["action_dispatch.remote_ip"] || ip).to_s
+      @remote_ip ||= (@env['action_dispatch.remote_ip'] || ip).to_s
     end
 
     def throttleable_remote_ip

config/initializers/webauthn.rb

@@ -6,7 +6,7 @@ WebAuthn.configure do |config|
   config.origin = "#{Rails.configuration.x.use_https ? 'https' : 'http'}://#{Rails.configuration.x.web_domain}"
 
   # Relying Party name for display purposes
-  config.rp_name = "Mastodon"
+  config.rp_name = 'Mastodon'
 
   # Optionally configure a client timeout hint, in milliseconds.
   # This hint specifies how long the browser should wait for an