[ruby/error_highlight] Fix leaked tempfiles

https://github.com/ruby/error_highlight/commit/8b353a10a7

test/error_highlight/test_error_highlight.rb

@@ -1002,34 +1002,36 @@ undefined method `time' for 1:Integer
   end
 
   def test_hard_tabs
-    tmp = Tempfile.new(["error_highlight_test", ".rb"], binmode: true)
-    tmp << "\t \t1.time {}\n"
-    tmp.close(false)
+    Tempfile.create(["error_highlight_test", ".rb"], binmode: true) do |tmp|
+      tmp << "\t \t1.time {}\n"
+      tmp.close
 
-    assert_error_message(NoMethodError, <<~END.gsub("_", "\t")) do
+      assert_error_message(NoMethodError, <<~END.gsub("_", "\t")) do
 undefined method `time' for 1:Integer
 
 _ _1.time {}
 _ _ ^^^^^
     END
 
-      load tmp.path
+        load tmp.path
+      end
     end
   end
 
   def test_no_final_newline
-    tmp = Tempfile.new(["error_highlight_test", ".rb"])
-    tmp << "1.time {}"
-    tmp.close(false)
+    Tempfile.create(["error_highlight_test", ".rb"]) do |tmp|
+      tmp << "1.time {}"
+      tmp.close
 
-    assert_error_message(NoMethodError, <<~END) do
+      assert_error_message(NoMethodError, <<~END) do
 undefined method `time' for 1:Integer
 
 1.time {}
  ^^^^^
     END
 
-      load tmp.path
+        load tmp.path
+      end
     end
   end
 end