chore: update astrolabe submodule to v0.13.9

Picks up astrolabe/astrolabe#61 which fixes app password provisioning
failure caused by loginName mismatch in ITokenProvider::generateToken().
This was the root cause of vector sync never indexing in multi-user
BasicAuth mode, which caused the plotly visualization test to fail.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: cbcoutinho