GHSA-gpwf-4h98-v82q: datadog-opentelemetry has unbounded W3C tracestate parsing that may lead to DoS

Datadog tracing libraries have a vulnerability where they parse incoming `tracestate` headers (part of W3C Trace Context, a standard for tracking requests across services) without limiting their size. An attacker can send an extremely large or complex `tracestate` header that forces the server to use excessive CPU and memory, causing a denial of service (DoS, where a service becomes unavailable). Since this parsing is enabled by default, any web service using an affected Datadog tracer version is at risk.