[BUG] Action fails when output separator requested is newline (\n)

[kunaltyagi]

Is there an existing issue for this?

• I have searched the existing issues

Does this issue exist in the latest version?

• I'm using the latest release

Describe the bug?

Action fails while setting output

To Reproduce

    - name: Find changed files
      uses: tj-actions/verify-changed-files@v14.0.1
      id: artifacts
      with:
        files: '*'
        separator: '\n'

What OS are you seeing the problem on?

ubuntu-latest or ubuntu-20.04

Expected behavior?

Proper handling of newline (or documentation to state it's not possible)

Relevant log output

Anything else?

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

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