Merge pull request #110 from ruby-syntax-tree/dependabot/bundler/rubocop-1.31.2

Bump rubocop from 1.31.1 to 1.31.2

Author: github-actions[bot]

Gemfile.lock

@@ -19,7 +19,7 @@ GEM
     rake (13.0.6)
     regexp_parser (2.5.0)
     rexml (3.2.5)
-    rubocop (1.31.1)
+    rubocop (1.31.2)
       json (~> 2.3)
       parallel (~> 1.10)
       parser (>= 3.1.0.0)