Address Github Actions Warnings

[Sn1p3rr3c0n]

Sample run with warnings: https://github.com/zymex22/Project-RimFactory-Revived/actions/runs/3298899047

[Sn1p3rr3c0n]

1. The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/ → ? https://github.com/zymex22/Project-RimFactory-Revived/actions/runs/3302629281/workflow#L22
2. .NET 5.0 is no longer supported and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the .NET support policy. → https://github.com/zymex22/Project-RimFactory-Revived/blob/master/.github/workflows/build_release.yml#L15
3. The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/ → ? https://github.com/zymex22/Project-RimFactory-Revived/actions/runs/3302629281/workflow#L22
4. Node.js 12 actions are deprecated. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/. Please update the following actions to use Node.js 16: actions/checkout, actions/setup-dotnet, mavrosxristoforos/get-xml-info, actions/checkout → Version of all actions

[InsanityPrelude]

Oh no, .NET 5.0 is end of support.

What's RimWorld use again...? 4.7.2? Lol.