Update ddtrace to >=4.3.0 for Python 3.14 support

ddtrace 2.21.1 doesn't support Python 3.14.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Bucknalla

Pipfile

@@ -14,7 +14,7 @@ flake8 = "==6.1.0"
 pytest = "==8.3.4"
 pydocstyle = "==5.0.2"
 coveralls = "==3.3.1"
-ddtrace = "==2.21.1"
+ddtrace = ">=4.3.0"
 pytest-cov = "*"
 build = "*"
 twine = "*"