V8 Github Actions fail install

with no changes to code, was installing gems fine on:

Current runner version: '2.274.2'
Operating System
  Ubuntu
  18.04.5
  LTS
Virtual Environment
  Environment: ubuntu-18.04
  Version: 20201115.1
  Included Software: https://github.com/actions/virtual-environments/blob/ubuntu18/20201115.1/images/linux/Ubuntu1804-README.md

but started failing on builds under:

Current runner version: '2.274.2'
Operating System
  Ubuntu
  18.04.5
  LTS
Virtual Environment
  Environment: ubuntu-18.04
  Version: 20201129.1
  Included Software: https://github.com/actions/virtual-environments/blob/ubuntu18/20201129.1/images/linux/Ubuntu1804-README.md