fix: ruby 4 doesn't include cgi or irb

[mkocher]

What is this change about?

Ruby 4 doesn't include cgi or irb. The CGI dependency can be dropped once prometheus_client is updated.

Please provide contextual information.

prometheus/client_ruby#330
prometheus/client_ruby#329

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 3c8cf41a-2fbb-418f-ba16-5ad6c6e84f1a

📥 Commits

Reviewing files that changed from the base of the PR and between 438fd13 and e7be916.

📒 Files selected for processing (1)

• src/bosh-director/bosh-director.gemspec

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Walkthrough

The BOSH Director gemspec now declares irb and cgi as runtime dependencies. Existing runtime dependencies remain unchanged, and the cgi entry includes a comment referencing a Prometheus Ruby issue.

Suggested reviewers: aramprice

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description covers the change and context, but it omits required sections for tests, release notes, breaking change, tags, and AI review feedback.	Add the missing template sections: tests run, release note blurb, breaking-change impact, tagged reviewers, and AI review feedback status.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding Ruby 4 compatibility by handling missing cgi and irb dependencies.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ruby-4-fixes

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