You can actually check these yourself by going to the CI details which (for this job) are available here! Seems to be a problem downloading Python.
==> Downloading https://ghcr.io/v2/homebrew/core/python/2/manifests/2.7.17_1
curl: (22) The requested URL returned error: 404
Error: Failed to download resource "python@2_bottle_manifest"
Download failed: https://ghcr.io/v2/homebrew/core/python/2/manifests/2.7.17_1
The command "tools/travis/install_dependencies.sh" failed and exited with 1 during .