Update actions/checkout action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v4 → v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

v5

Compare Source

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Configuration

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🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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

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Greptile Overview

Greptile Summary

Updated actions/checkout from v4 to v6 across two workflow files (release.yml and version-bump.yml). This is a routine dependency update that brings the workflows in line with the CI workflow which already uses v6.

• Updated 3 instances of actions/checkout action (2 in release workflow, 1 in version-bump workflow)
• No changes to workflow logic, permissions, or configuration
• The CI workflow (.github/workflows/ci.yml) already uses actions/checkout@v6, confirming compatibility with the repository
• All usages maintain the same configuration parameters (token parameter where needed)

This is a straightforward dependency update with no functional changes to the workflows.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The changes are purely version bumps of a well-maintained GitHub Action with no logic changes, no breaking configuration changes, and existing evidence (ci.yml) that v6 already works in this repository
• No files require special attention

Important Files Changed

Filename	Overview
.github/workflows/release.yml	Updated actions/checkout from v4 to v6 in two workflow steps (create-release and publish jobs)
.github/workflows/version-bump.yml	Updated actions/checkout from v4 to v6 in the bump-version job

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant GH as GitHub
    participant ReleaseWF as Release Workflow
    participant BumpWF as Version Bump Workflow
    participant Checkout as actions/checkout@v6
    
    Note over Dev,Checkout: Version Bump Workflow (Manual Trigger)
    Dev->>GH: Trigger workflow_dispatch
    GH->>BumpWF: Start version-bump job
    BumpWF->>Checkout: Checkout repository (v6)
    Checkout-->>BumpWF: Repository code
    BumpWF->>BumpWF: Bump version in version.rb
    BumpWF->>GH: Create version bump PR
    
    Note over Dev,Checkout: Release Workflow (On PR Merge)
    Dev->>GH: Merge version bump PR
    GH->>ReleaseWF: Trigger on PR merge
    ReleaseWF->>Checkout: Checkout repository (v6)
    Checkout-->>ReleaseWF: Repository code
    ReleaseWF->>ReleaseWF: Read version from version.rb
    ReleaseWF->>GH: Create GitHub release
    ReleaseWF->>Checkout: Checkout for publish job (v6)
    Checkout-->>ReleaseWF: Repository code
    ReleaseWF->>ReleaseWF: Run tests and build gem
    ReleaseWF->>GH: Publish to RubyGems

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