Fix: Add Python 3.14 constraint to ddtrace dependency (issue #1562)

[swati1kumari]

The upper limit of ddtrace in pyproject.toml causes build failures on Python 3.14 because ddtrace 2.x only provides wheels up to Python 3.13. This commit adds a Python version constraint to prevent Python 3.14+ from attempting to build a wheel for ddtrace<3.0, which would fail due to missing pkg_resources dependency.

Fixes #1562

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Fix: Add Python 3.14 constraint to ddtrace dependency

Fixes #1562

The upper limit of ddtrace in pyproject.toml causes build failures on Python 3.14 because ddtrace 2.x only provides wheels up to Python 3.13. This adds a Python version constraint to prevent Python 3.14+ from attempting to build a wheel for ddtrace<3.0.