ci: deps: Use testground-github-action from testground org

[galargh]

Proposed Changes

Start using testground-github-action from testground organisation - https://github.com/testground/testground-github-action.

Additional Info

I copied the action to testground organisation and released it in there - https://github.com/testground/testground-github-action/releases/tag/v1.0.0

The action development is going to continue there.

Checklist

Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green