Bump rake from 12.3.0 to 12.3.1

Bumps [rake](https://github.com/ruby/rake) from 12.3.0 to 12.3.1.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v12.3.0...v12.3.1)

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

Gemfile.lock

@@ -439,7 +439,7 @@ GEM
  thor (>= 0.18.1, < 2.0)
  rainbow (3.0.0)
  raindrops (0.19.0)
- rake (12.3.0)
+ rake (12.3.1)
  recaptcha (4.6.6)
  json
  redis (4.0.1)