Update dependency puma to v4 - autoclosed

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This PR contains the following updates:

Package	Update	Change
puma	major	'~> 3.7' -> '~> 4.0'

By merging this PR, the issue #10 will be automatically resolved and closed:

Severity	CVSS Score	CVE
High	7.5	CVE-2021-29509
Medium	5.9	CVE-2022-23634
Low	3.7	CVE-2021-41136

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• [ ] If you want to rebase/retry this PR, check this box

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⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: Gemfile.lock

No tool defined - skipping: bundler