Investigate workflow job failing on main: test / test (job 2)

[github-actions]

🚨 Failure Summary 🚨:

• 📋 Job Name: test / test (job 2)
• 🔧 Failure in Workflow: Process new code merged to main
• 🔗 Triggered by PR: PR Link
• 👤 PR Author: @dominictb
• 🤝 Merged by: @srikarparsi
• 🐛 Error Message:
  warning: The following actions use a deprecated Node.js version and will be forced to run on node20: SimenB/github-actions-cpu-cores@31e91de. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/
  failure: Process completed with exit code 1.

⚠️ Action Required ⚠️:

🛠️ A recent merge appears to have caused a failure in the job named test / test (job 2).
This issue has been automatically created and labeled with Workflow Failure for investigation.

👀 Please look into the following:

1. Why the PR caused the job to fail?
2. Address any underlying issues.

🐛 We appreciate your help in squashing this bug!

[srikarparsi]

Duplicate of this and this so doesn't seem to be caused by this PR. Also this related issue was created.