Bump pgvector from 0.3.6 to 0.4.0

Bumps [pgvector](https://github.com/pgvector/pgvector-python) from 0.3.6 to 0.4.0.
- [Changelog](https://github.com/pgvector/pgvector-python/blob/master/CHANGELOG.md)
- [Commits](pgvector/pgvector-python@v0.3.6...v0.4.0)

---
updated-dependencies:
- dependency-name: pgvector
  dependency-version: 0.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: poetry.lock

@@ -20,7 +20,7 @@ pinecone = {version = "^6.0", extras = ["grpc"]}
 tabulate = "^0.9.0"
 pydantic = "^2.11.3"
 locust-plugins = "^4.5.3"
-pgvector = "^0.3.6"
+pgvector = "^0.4.0"
 psycopg = "^3.2.6"
 hdrhistogram = "^0.10.3"
 tenacity = "^9.0.0"