Bump duckduckgo-search from 6.1.7 to 6.2.9

Bumps [duckduckgo-search](https://github.com/deedy5/duckduckgo_search) from 6.1.7 to 6.2.9.
- [Release notes](https://github.com/deedy5/duckduckgo_search/releases)
- [Commits](deedy5/duckduckgo_search@v6.1.7...v6.2.9)

---
updated-dependencies:
- dependency-name: duckduckgo-search
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -1,5 +1,5 @@
 faiss-cpu==1.8.0
-duckduckgo_search==6.1.7
+duckduckgo_search==6.2.9
 beautifulsoup4==4.12.3
 langchain==0.2.1
 langchain-community==0.2.1