Update dependency puma to v6

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Update	Change
puma	major	'~> 3.0' -> '~> 6.0'

By merging this PR, the issue #8 will be automatically resolved and closed:

Severity	CVSS Score	CVE
Critical	9.8	CVE-2023-40175
High	7.5	CVE-2021-29509
Medium	5.9	CVE-2022-23634
Medium	5.9	CVE-2024-21647
Low	3.7	CVE-2021-41136

---

• [ ] 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

installing v2 tool bundler v1.16.1
linking tool bundler v1.16.1

/opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/shared_helpers.rb:266:in `search_up': undefined method `untaint' for "/tmp/renovate/github/nexmo-community/nexmo-customer-service-chat-demo":String (NoMethodError)

      current  = File.expand_path(SharedHelpers.pwd).untaint
                                                    ^^^^^^^^
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/shared_helpers.rb:253:in `find_file'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/shared_helpers.rb:245:in `find_gemfile'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/shared_helpers.rb:27:in `root'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler.rb:218:in `root'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler.rb:230:in `app_config_path'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler.rb:257:in `settings'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/env.rb:20:in `report'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/friendly_errors.rb:96:in `request_issue_report_for'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/friendly_errors.rb:46:in `log_error'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/friendly_errors.rb:126:in `rescue in with_friendly_errors'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/friendly_errors.rb:121:in `with_friendly_errors'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/exe/bundle:22:in `<top (required)>'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/exe/bundler:4:in `load'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/exe/bundler:4:in `<top (required)>'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/bin/bundler:25:in `load'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/bin/bundler:25:in `<main>'
/opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/shared_helpers.rb:266:in `search_up': undefined method `untaint' for "/tmp/renovate/github/nexmo-community/nexmo-customer-service-chat-demo":String (NoMethodError)

      current  = File.expand_path(SharedHelpers.pwd).untaint
                                                    ^^^^^^^^
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/shared_helpers.rb:253:in `find_file'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/shared_helpers.rb:245:in `find_gemfile'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/shared_helpers.rb:27:in `root'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler.rb:218:in `root'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler.rb:230:in `app_config_path'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler.rb:257:in `settings'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/feature_flag.rb:21:in `block in settings_method'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/cli.rb:97:in `<class:CLI>'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/cli.rb:7:in `<module:Bundler>'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/cli.rb:6:in `<top (required)>'
    from <internal:/opt/buildpack/tools/ruby/3.2.1/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:88:in `require'
    from <internal:/opt/buildpack/tools/ruby/3.2.1/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:88:in `require'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/exe/bundle:23:in `block in <top (required)>'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/lib/bundler/friendly_errors.rb:122:in `with_friendly_errors'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/exe/bundle:22:in `<top (required)>'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/exe/bundler:4:in `load'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/gems/bundler-1.16.1/exe/bundler:4:in `<top (required)>'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/bin/bundler:25:in `load'
    from /opt/buildpack/tools/bundler/1.16.1/3.2/bin/bundler:25:in `<main>'