chore: update actions/checkout to v4.2.2

[capytan]

Motivation / Background

This Pull Request has been created to improve the security and stability of our GitHub Actions workflow by updating the actions/checkout action to a specific version. This follows the security best practice recommended by GitHub to prevent potential supply chain attacks.

Detail

This Pull Request changes the version reference in our GitHub Actions workflow from a floating version tag to a specific commit hash:

• Updates actions/checkout from v2 to v4.2.2 (commit hash: 11bd71901bbe5b1630ceea73d27597364c9af683)

Checklist

• This Pull Request is related to one change. Unrelated changes should be opened in separate PRs.
• Commit message has a detailed description of what changed and why.
• No tests are needed as this is a workflow configuration change.
• No CHANGELOG update needed as this is an internal workflow change.

[nappannda]

LGTM〜〜〜