chore(deps): lock file maintenance (#137)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Gemfile.lock

@@ -64,7 +64,7 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     logger (1.7.0)
-    minitest (6.0.5)
+    minitest (6.0.6)
       drb (~> 2.0)
       prism (~> 1.5)
     nap (1.1.0)