Linebreaks in artifact name cause an "Unexpected response"

[YellowAfterlife]

Describe the bug
Including linebreaks in your artifact name causes unusual state where the build errors out but artifact is still uploaded (albeit without linebreaks)

Version

• V1
• V2

Environment

• self-hosted
• Linux
• Windows
• Mac

Screenshots

Run/Repo Url
https://github.com/YAL-GameMaker/steamworks.gml/actions/runs/666009729

How to reproduce
If applicable, add information on how to reproduce the problem.

      - name: Upload artifact
        uses: actions/upload-artifact@v2
        with:
          name: |
            line 1
            line 2
          path: ./file

Additional context
Pretty low-priority if anything - I was testing what I could and could not do to make artifact labels more readable, and figured that I'd try a linebreak since it wasn't on the forbidden character list

[konradpabjan]

This was fixed a while back ago (forgot to close out after release). Newline characters are not allowed anymore and the run fails