build(deps): update langchain-anthropic requirement

Updates the requirements on [langchain-anthropic](https://github.com/langchain-ai/langchain) to permit the latest version.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-anthropic==0.3.10...langchain-anthropic==0.3.12)

---
updated-dependencies:
- dependency-name: langchain-anthropic
  dependency-version: 0.3.12
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -14,7 +14,7 @@ drf-yasg = "1.21.7"
 django-filter = "23.2"
 langchain = "0.3.23"
 langchain-openai = "0.3.12"
-langchain-anthropic = "0.3.10"
+langchain-anthropic = "0.3.12"
 langchain-community = "0.3.21"
 langchain-deepseek = "0.1.3"
 langchain-google-genai = "2.1.2"