chore: update crewAI and dependencies to version 0.141.0 and 0.51.0 (#3128)

- Bump crewAI version to 0.141.0 in __init__.py for alignment with updated dependencies.
- Update `crewai-tools` dependency version to 0.51.0 in pyproject.toml and related template files.
- Add new testing dependencies: pytest-split and pytest-xdist for improved test execution.
- Ensure compatibility with the latest package versions in uv.lock and template files.

pyproject.toml

@@ -47,7 +47,7 @@ Documentation = "https://docs.crewai.com"
 Repository = "https://github.com/crewAIInc/crewAI"
 
 [project.optional-dependencies]
-tools = ["crewai-tools~=0.49.0"]
+tools = ["crewai-tools~=0.51.0"]
 embeddings = [
     "tiktoken~=0.8.0"
 ]