fix: semver resource uses git

[mkocher]

What is this change about?

This makes the semver resource use git instead of a gcs bucket that runs the risk of being garbage collected.

Please provide contextual information.

#2765

[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: 44362420-1c69-45d2-8b89-cdcbd7af8312

📥 Commits

Reviewing files that changed from the base of the PR and between 642cb07 and fe19188.

📒 Files selected for processing (1)

• ci/pipeline.yml

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Walkthrough

Updated the Concourse version semver resource to read the version from the release-details branch and release-version file in the BOSH Git repository. The configuration now uses the configured GitHub deploy key and sets initial_version to 282.1.17, replacing the previous GCS-backed source.

🚥 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 omits required sections for tests, release notes, breaking changes, tags, and AI review feedback.	Add the missing template sections with test results, release note wording, breaking-change impact, team tags, and AI review feedback status.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main change to move the semver resource to Git.
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 unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch semver-uses-git

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