community[patch]: deprecate persist method in Chroma (#20855)

Thank you for contributing to LangChain!

- [x] **PR title**

- [x] **PR message**:
- **Description:** Deprecate persist method in Chroma no longer exists
in Chroma 0.4.x
    - **Issue:** #20851 
    - **Dependencies:** None
    - **Twitter handle:** AndresAlgaba1

- [x] **Add tests and docs**: If you're adding a new integration, please
include
1. a test for the integration, preferably unit tests that do not rely on
network access,
2. an example notebook showing its use. It lives in
`docs/docs/integrations` directory.

- [x] **Lint and test**: Run `make format`, `make lint` and `make test`
from the root of the package(s) you've modified. See contribution
guidelines for more: https://python.langchain.com/docs/contributing/

---------

Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>

libs/community/tests/integration_tests/vectorstores/test_chroma.py

@@ -136,8 +136,6 @@ def test_chroma_with_persistence() -> None:
     output = docsearch.similarity_search("foo", k=1)
     assert output == [Document(page_content="foo")]
 
-    docsearch.persist()
-
     # Get a new VectorStore from the persisted directory
     docsearch = Chroma(
         collection_name=collection_name,