[Snyk] Security upgrade puma from 3.6.0 to 3.12.2

[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	Exploit Maturity
	HTTP Response Splitting SNYK-RUBY-PUMA-559020	No	No Known Exploit

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

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

For more information:

🧐 View latest project report

🛠 Adjust project settings

📚 Read more about Snyk's upgrade and patch logic