Merge pull request #268 from mruby/dependabot/bundler/rake-13.4.1

Author: matz

Gemfile.lock

@@ -85,7 +85,7 @@ GEM
       date
       stringio
     public_suffix (7.0.5)
-    rake (13.3.1)
+    rake (13.4.1)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)