Describe the bug
A clear and concise description of what the bug is.
Self-hosted runner fails on Mac
Which version of the action are you using?
See this issue with both versions

• [ x] v1
• [ x] v2
• Some other tag (such as v2.0.1 or master)

Environment

• self-hosted
• Linux
• Windows
• [x ] Mac

If applicable, please specify if you're using a container

Python Versions
Please list all of the effected versions of Python (3.8.2, etc.)
3.7.3, 3.7.7
To Reproduce
Steps to reproduce the behavior:

• Run action https://github.com/sanzgiri/action-numerai/runs/715859359

• If I specify python 3.7.3 or 3.7.7 for the action, it fails
  ##[error]Version 3.7.3 with arch x64 not found even though that is currently the version on the mac

• If I specify python-version: '3.x'
  I get the error:

Version 3.x was not found in the local cache
Version 3.x is available for downloading
Download from "https://github.com/actions/python-versions/releases/download/3.8.3-20200514.1/python-3.8.3-macos-1014-x64.tar.gz"
Extract downloaded archive
/usr/bin/tar xz -C ./9c99d59e-64bf-4cba-9166-fe20af925cd6 -f /Users/sanzgiri/actions-runner/_work/_temp/9c99d59e-64bf-4cba-9166-fe20af925cd6
Execute installation script
##[error]The process '/bin/bash' failed with exit code 134

Run/Repo Url
If applicable, and if your repo/run is public, please include a URL so it is easier for us to investigate.
Private Repo

Screenshots
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Additional context
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