Update CI build scripts

[Gumball2415]

This pull request aims to update GitHub Actions scripts.

Note: A vulnerability in @actions/download-artifact (GHSA-cxww-7g56-2vh6) has been detected by Dependabot, but is automatically resolved due to the scripts using the general @v4 tag.

Changes in this PR:

• Compact commit hash variable init in build arifact script
• Remove AppVeyor CI integration
  • This addresses Appveyor integrated builds fail due to pandoc install build script #283.
  • AppVeyor is less convenient than GitHub Actions as it is much slower to
    complete multiple builds.
  • Having AppVeyor integration also has the added cost of needing to maintain two separate build
    script formats rather than a single one.
• Update GitHub Actions script for generating draft releases
  • This fixes Use better Github Action script for deploying draft releases #252.
  • Using action-gh-release as it is more recently maintained.
• Update version_update.md to be a checklist guide

[nyanpasu64]

• did you test the new release script works as intended? idk how to test without merging first
• not a change that needs to be made, but https://nightly.link/ can be used to download github actions builds without login.

[Gumball2415]

• did you test the new release script works as intended? idk how to test without merging first

  • yes, in my own fork dedicated for testing GitHub CI: https://github.com/Gumball2415/Dn-FamiTracker

• not a change that needs to be made, but https://nightly.link/ can be used to download github actions builds without login.

  • i will try to add this to the README for users to download artifacts
  • edit: this will be done in a separate PR.