Update faiss-cpu requirement from ~=1.8 to ~=1.9

Updates the requirements on [faiss-cpu](https://github.com/kyamagu/faiss-wheels) to permit the latest version.
- [Release notes](https://github.com/kyamagu/faiss-wheels/releases)
- [Commits](kyamagu/faiss-wheels@v1.8.0...v1.9.0)

---
updated-dependencies:
- dependency-name: faiss-cpu
  dependency-type: direct:production
...

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

requirements.txt

@@ -1,5 +1,5 @@
 black~=24.10
-faiss-cpu~=1.8
+faiss-cpu~=1.9
 numpy~=1.26
 pandas~=2.2
 poetry~=1.8