@empirica/core@1.9.4

Patch Changes

• 40a5d5c: Improve callback ordering by only allowing 1 callback to run at a time. This is
  change also make addScopes await for the scope changes to be added locally
  before returning.
• 0994940: Enable empirica serve to run in the official Docker container image.
• aa7fd43: Log connection errors instead of throwing unhanded exceptions.
• 434e36a: Avoid blocking on concurrent release of step stopping timer.