security: add explicit urllib3>=2.6.3 to fix 6 high severity CVEs

- Add urllib3>=2.6.3 constraint to dependencies
- Fixes 6 high severity vulnerabilities in urllib3 (transitive dependency)
- Addresses GitHub security alerts for decompression vulnerabilities
- Forces upgrade from vulnerable 2.6.2 to secure 2.6.3+

Author: fgogolli

pyproject.toml

@@ -48,6 +48,7 @@ dependencies = [
     "sqlalchemy>=2.0.0",
     "dynaconf>=3.2.0",
     "structlog>=23.1.0",
+    "urllib3>=2.6.3",  # Security: Fix CVE vulnerabilities
     "opentelemetry-api>=1.20.0",
     "opentelemetry-sdk>=1.20.0",
     "psutil>=5.9.0",