v2.1.1 - security updates

What's Changed

• Bump rack from 3.0.6.1 to 3.0.9.1 in /test by @dependabot in #43
• Bump rexml from 3.2.5 to 3.2.8 in /test by @dependabot in #44
• Bump rexml from 3.2.8 to 3.3.3 in /test by @dependabot in #45
• Bump rexml from 3.3.3 to 3.3.6 in /test by @dependabot in #46

Full Changelog: v2.1.0...v2.1.1