Update deprecated GitHub Actions to current versions

[Copilot]

The workflow uses actions/upload-artifact@v1.0.0, which was deprecated February 13, 2024. Other actions also use outdated versions or branch references instead of version tags.

Changes

• actions/checkout: @master → @v4 (pinned version tag)
• actions/upload-artifact: v1.0.0 → v4 (resolves deprecation)
• microsoft/setup-msbuild: v1 → v2

Before:

- uses: actions/checkout@master
- uses: actions/upload-artifact@v1.0.0
  with:
    name: BepInEx.Debug
    path: bin

After:

- uses: actions/checkout@v4
- uses: actions/upload-artifact@v4
  with:
    name: BepInEx.Debug
    path: bin

Original prompt

The build workflow for the BepInEx/BepInEx.Debug repository is failing due to the usage of deprecated versions of GitHub Actions. Specifically, actions/upload-artifact is using an outdated version (v1.0.0), which has been deprecated as of the GitHub change log from 2024-02-13 (see changelog). This needs to be updated to a currently supported version, such as v3.0.0. Additionally, any other deprecated or outdated actions used in the workflows should be updated to their latest recommended versions to ensure future compatibility and reliability.

Tasks to complete:

1. Update actions/upload-artifact to at least v3.0.0.
2. Identify and update any other deprecated or outdated GitHub Actions in the workflow files.
3. Test the updates to ensure that the build workflow completes successfully without errors.
4. Include clear and concise documentation in the PR description regarding the changes made and why they are necessary.

This pull request was created from Copilot chat.

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Pull request overview

This PR updates deprecated and outdated GitHub Actions in the build workflow to their current versions, addressing the deprecation of actions/upload-artifact@v1.0.0 (deprecated February 13, 2024) and improving overall workflow reliability.

Key Changes:

• Updated actions/checkout from branch reference (@master) to pinned version tag (@v4)
• Updated actions/upload-artifact from deprecated v1.0.0 to current v4
• Updated microsoft/setup-msbuild from v1 to v2

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