Bump rake from 12.0.0 to 13.0.6

Bumps [rake](https://github.com/ruby/rake) from 12.0.0 to 13.0.6.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v12.0.0...v13.0.6)

---
updated-dependencies:
- dependency-name: rake
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -103,7 +103,7 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    rake (12.0.0)
+    rake (13.0.6)
     slop (3.6.0)
     sprockets (3.7.1)
       concurrent-ruby (~> 1.0)