Bump actions/checkout to v5

[SamErde]

Description

This pull request updates the GitHub Actions workflows to use the latest version of the actions/checkout action. The main change is upgrading from version 4 to version 5 in all relevant workflow files.

GitHub Actions maintenance:

• .github/workflows/copy-tags.yml: Updated the actions/checkout step from version 4 to version 5 to ensure compatibility and benefit from the latest improvements.
• .github/workflows/test-action.yml: Updated all occurrences of actions/checkout@v4 to actions/checkout@v5 for both code and action checkouts, ensuring consistency and up-to-date dependencies in the workflow. [1] [2]

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[Copilot]

Pull Request Overview

This PR updates the GitHub Actions workflow files by upgrading the actions/checkout action from v4 to v5 and removes trailing whitespace from several lines.

• Updated actions/checkout from v4 to v5 across all workflow files
• Cleaned up trailing whitespace on empty lines in workflow YAML files

Reviewed Changes

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

File	Description
.github/workflows/test-action.yml	Updated checkout action to v5 in two job steps and removed trailing whitespace from empty lines
.github/workflows/copy-tags.yml	Updated checkout action to v5 and removed trailing whitespace from an empty line

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