Update supported-branches.json in buildbot repo to point to main

Bug: skia:11962
Change-Id: Ieae93763aae53102bbff177f910012b36e486ebf
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/404797
Reviewed-by: Eric Boren <borenet@google.com>
1 file changed
tree: e865f15e31707026b243d117ac2f848388f32ac5
  1. generated/
  2. codereview.settings
  3. commit-queue.cfg
  4. luci-logdog.cfg
  5. main.star
  6. OWNERS
  7. project.cfg
  8. README.md
  9. supported-branches.json
README.md

This branch contains project-wide configuration files for infra services.