Update minitest to version 5.14.2 (#36)

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

Author: depfu[bot]

Gemfile.lock

@@ -101,7 +101,7 @@ GEM
     mimemagic (0.3.5)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
-    minitest (5.14.1)
+    minitest (5.14.2)
     momentjs-rails (2.20.1)
       railties (>= 3.1)
     nio4r (2.5.2)