[ruby/reline] Fix tempfile leaks

(https://github.com/ruby/reline/pull/757)

https://github.com/ruby/reline/actions/runs/11187507536/job/31104699331#step:13:1064
```
Children under /tmp/rubytest.m48l5o:
* -rw------- 1 101 2024-10-02 17:43:51 +0000 rubyfile20241002-60503-bhbfgq
```

https://github.com/ruby/reline/commit/1287f97a6f

test/reline/test_reline.rb

@@ -471,6 +471,8 @@ class Reline::Test < Reline::TestCase
       w.close
       Process.waitpid pid
     end
+  ensure
+    File.delete(ruby_file.path) if ruby_file
   end
 
   def get_reline_encoding

test/reline/yamatanooroti/test_rendering.rb

@@ -1814,6 +1814,9 @@ begin
       write "\ebg"
       assert_screen(/>abc\n>def\n>ghi\n/)
       close
+    ensure
+      File.delete(rubyfile.path) if rubyfile
+      File.delete(pidfile.path) if pidfile
     end
 
     def write_inputrc(content)