gems: update rubocop to version 0.89.0

Update rubocop to version 0.89.0 (#59)

Co-authored-by: depfu[bot] <23717796+depfu[bot]@users.noreply.github.com>

dyndnsd.gemspec

@@ -39,6 +39,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rack-test'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
-  s.add_development_dependency 'rubocop', '~> 0.88.0'
+  s.add_development_dependency 'rubocop', '~> 0.89.0'
   s.add_development_dependency 'solargraph'
 end

lib/dyndnsd.rb

@@ -245,7 +245,7 @@ module Dyndnsd
       if config['logfile']
         Dyndnsd.logger = Logger.new(config['logfile'])
       else
-        Dyndnsd.logger = Logger.new(STDOUT)
+        Dyndnsd.logger = Logger.new($stdout)
       end
 
       Dyndnsd.logger.progname = 'dyndnsd'

lib/dyndnsd/generator/bind.rb

@@ -27,7 +27,7 @@ module Dyndnsd
           ips.each do |ip|
             ip = IPAddr.new(ip).native
             type = ip.ipv6? ? 'AAAA' : 'A'
-            name = hostname.chomp('.' + @domain)
+            name = hostname.chomp(".#{@domain}")
             out << "#{name} IN #{type} #{ip}"
           end
         end

spec/daemon_spec.rb

@@ -6,7 +6,7 @@ describe Dyndnsd::Daemon do
   include Rack::Test::Methods
 
   def app
-    Dyndnsd.logger = Logger.new(STDOUT)
+    Dyndnsd.logger = Logger.new($stdout)
     Dyndnsd.logger.level = Logger::UNKNOWN
 
     config = {