Fix build failures by upgrading deprecated GitHub Actions

[Copilot]

Problem

The CI/CD builds were failing with the following error:

Error: This request has been automatically failed because it uses a deprecated version of `actions/upload-artifact: v2`. 
Learn more: https://github.blog/changelog/2024-02-13-deprecation-notice-v1-and-v2-of-the-artifact-actions/

As of February 13, 2024, GitHub deprecated v1 and v2 of the artifact actions, causing all workflows using these versions to fail automatically.

Solution

This PR upgrades all GitHub Actions in the workflow files to their latest stable versions:

Updated Actions:

• actions/upload-artifact: v2 → v4 (fixes the build failure)
• actions/checkout: v2 → v4
• actions/setup-go: v2 → v5

Files Modified:

• .github/workflows/archive-repo.yml
• .github/workflows/appimage.yml

Benefits

• ✅ Fixes the immediate build failures caused by deprecated actions
• ✅ Improves security by using actively maintained action versions
• ✅ Enables access to performance improvements in newer action versions
• ✅ Ensures compatibility with current GitHub Actions infrastructure

Testing

• Validated YAML syntax for both workflow files
• Changes are minimal and only affect action version numbers
• No functional changes to the build process or artifact outputs

Resolves #issue_number

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Builds are currently failing</issue_title>
<issue_description>Error: This request has been automatically failed because it uses a deprecated version of actions/upload-artifact: v2. Learn more: https://github.blog/changelog/2024-02-13-deprecation-notice-v1-and-v2-of-the-artifact-actions/</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #3

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