Uninitialized constant RuboCop::Lockfile::Bundler

[sramsden]

Just started seeing this yesterday.
I can't work out if this is a rubocop or pronto thing, so apologies if it's rubocop.
It's rubocop code but it's complaint sounds like pronto is not loading the required class?
Has anyone seen this?
I am running pronto as a github action..

jobs:
  pronto:
    if: ${{ github.ref != 'refs/heads/master' }}
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2
        with:
          fetch-depth: 10
      - run: git fetch --no-tags --prune --depth=10 origin master:master
      - name: Setup Ruby
        uses: ruby/setup-ruby@v1
      - name: Setup pronto
        run: gem install pronto pronto-rubocop rubocop-rails
      - name: Run Pronto
        run: pronto run --commit $(git merge-base --fork-point master) --runner rubocop --exit-code

[JanCBrammer]

@sramsden, see rubocop/rubocop#12823.

[sramsden]

Thanks @JanCBrammer