chore(deps): Bump chromadb in /examples/langchain-chroma

Bumps [chromadb](https://github.com/chroma-core/chroma) from 0.5.5 to 0.5.7.
- [Release notes](https://github.com/chroma-core/chroma/releases)
- [Changelog](https://github.com/chroma-core/chroma/blob/main/RELEASE_PROCESS.md)
- [Commits](chroma-core/chroma@0.5.5...0.5.7)

---
updated-dependencies:
- dependency-name: chromadb
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

examples/langchain-chroma/requirements.txt

@@ -1,4 +1,4 @@
 langchain==0.3.0
 openai==1.45.1
-chromadb==0.5.5
+chromadb==0.5.7
 llama-index==0.11.7