Bump to actions/checkout@v7

[randytarampi]

Per the title and the commit.

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Summary by cubic

Upgrade actions/checkout to v7 in the lint and unit workflows to pick up the latest security and performance fixes. Aligns with DEED-745 to modernize our GitHub Actions.

^{Written for commit 13e0033. Summary will update on new commits.}

[bonterra-integrations-serviceuser]

✅ Snyk checks have passed. No issues have been found so far.

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[Copilot]

Pull request overview

This PR updates the GitHub Actions workflows to use actions/checkout@v7, keeping CI aligned with the latest upstream security/performance fixes for repository checkout.

Changes:

• Bump actions/checkout from v4 to v7 in the Unit Test workflow.
• Bump actions/checkout from v4 to v7 in the Lint workflow.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/unit.yml	Updates the checkout action used by the unit test job to actions/checkout@v7.
.github/workflows/lint.yml	Updates the checkout action used by the lint job to actions/checkout@v7.

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[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}