Update to semconv 1.39.0

[zehenrique]

The latest version of OTel Semantic conventions is 1.39.0:
https://github.com/open-telemetry/semantic-conventions/releases/tag/v1.39.0

[breedx-splk]

Resolved in #396 (and the latest release!) 🚀

[trask]

@zehenrique thanks for reporting this! I've sent some automation #404 to hopefully keep us on track going forward.