fix(embedded-db): bump pg0-embedded to 0.14.2 for clean stop/restart (#1892)

pg0-embedded 0.14.2 makes `pg0 stop` wait for the postmaster to fully
exit (pg_ctl -w semantics) instead of sending SIGTERM and returning
after a fixed 2s sleep. The old behaviour let DaemonEmbedManager.stop()
return while PostgreSQL was still draining, so a following start raced
the still-live postmaster.pid and either failed or logged 'unexpected
postmaster exit'.

Raise the floor from >=0.14.0 to >=0.14.2 so the fix is always present.

Fixes #1796

Author: nicoloboschi

hindsight-api-slim/pyproject.toml

@@ -93,7 +93,7 @@ local-llm = [
     "huggingface-hub>=0.20.0",
 ]
 embedded-db = [
-    "pg0-embedded>=0.14.0",
+    "pg0-embedded>=0.14.2",
 ]
 oracle = [
     "oracledb>=2.5.0",