[Snyk] Fix for 1 vulnerabilities

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `rubygems` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • Gemfile
  • Gemfile.lock

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change
	Information Exposure SNYK-RUBY-RACK-538324	No

Check the changes in this PR to ensure they won't cause issues with your project.

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[top-on]

@ubergesundheit should be merge this PR, just in case?

[ubergesundheit]

I don’t know if this runs anywhere.. so if you want, but it would be better if we would mark this repository as archived and leave the dead alone :D