chore(deps): update dependency ddtrace to v2.4.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ddtrace (changelog)	2.4.0 -> 2.4.1

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Release Notes

DataDog/dd-trace-py (ddtrace)

v2.4.1: 2.4.1

Compare Source

Bug Fixes

• IAST: Don't split AST Assign nodes since it's not needed for propagation to work.
• CI Visibility: Fix for an import issue that caused the pytest plugin to fail to properly initialize a test session and exit with an import exception.
• tracing: Fixes a bug that prevents span links from being visualized in the Datadog UI.
• Vulnerability Management for Code-level (IAST): Fix an unhandled ValueError in ast_function thrown in some cases (i.e. Numpy arrays when converted to bool).
• langchain: This fix resolves an get_openai_token_cost_for_model import error in langchain version 0.0.351 or later.
• tracing: Ensures all fields in ddtrace.context.Context are picklable.

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