Update pinned action versions

[Jayden Chan (jayden-chan)]

Description of the change

Description here

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation or Development tools (readme, specs, tests, code formatting)

Links

• Jira issue number: (PUT IT HERE)
• Process.st launch checklist: (PUT IT HERE)

Checklists

Development

• Prettier was run (if applicable)
• The behaviour changes in the pull request are covered by specs
• All tests related to the changed code pass in development

Paperwork

• This pull request has a descriptive title and information useful to a reviewer
• This pull request has a Jira number
• This pull request has a Process.st launch checklist

Code review

• Changes have been reviewed by at least one other engineer
• Security impacts of this change have been considered

[Copilot]

Pull request overview

This PR updates the pinned GitHub Actions actions/checkout commit SHA across multiple workflows, keeping CI/CD dependencies current while maintaining supply-chain best practices (pinning to a full commit SHA).

Changes:

• Bumped actions/checkout from a v6.x pinned commit to a v7.0.0 pinned commit SHA.
• Applied the same updated pin consistently across the affected CI/release workflows.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.github/workflows/tests.yml	Updates actions/checkout pin used by the test matrix workflow.
.github/workflows/stencilbook.yml	Updates actions/checkout pin used by the stencilbook build workflow.
.github/workflows/publish-package.yml	Updates actions/checkout pin used by the package publish workflow.
.github/workflows/mint-components-release.yml	Updates actions/checkout pin used by the mint-components release workflow.
.github/workflows/deep-forest.yml	Updates actions/checkout pin used by the deep-forest deploy workflow.

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