fixup! Simplify socket connection to use IPv4 only

Author: rafaelfranca

test/test_reporters/minitest_reporter_test.rb

@@ -173,7 +173,7 @@ def test_minitest_spec_output
     def gather_events(uri, output: :stdout)
       plugin_path = File.expand_path("lib/ruby_lsp/test_reporters/minitest_reporter.rb")
 
-      server = TCPServer.new("localhost", 0)
+      server = TCPServer.new("127.0.0.1", 0)
       port = server.addr[1].to_s
       events = []
       socket = nil #: Socket?

test/test_reporters/test_unit_reporter_test.rb

@@ -97,7 +97,7 @@ def test_crashing_example
     def gather_events(uri, output: :stdout)
       reporter_path = File.expand_path(File.join("lib", "ruby_lsp", "test_reporters", "test_unit_reporter.rb"))
 
-      server = TCPServer.new("localhost", 0)
+      server = TCPServer.new("127.0.0.1", 0)
       port = server.addr[1].to_s
       events = []
       socket = nil #: Socket?