Merge pull request #409 from ruby-syntax-tree/dependabot/bundler/minitest-5.20.0

Bump minitest from 5.19.0 to 5.20.0

Author: github-actions[bot]

Gemfile.lock

@@ -12,7 +12,7 @@ GEM
     docile (1.4.0)
     json (2.6.3)
     language_server-protocol (3.17.0.3)
-    minitest (5.19.0)
+    minitest (5.20.0)
     parallel (1.23.0)
     parser (3.2.2.3)
       ast (~> 2.4.1)