Update to OTel 1.6.x

[carlosalberto]

We should update to OTel Java 1.6.x and adjust in case there's anything breaking, including checking the release notes for OTel Java/Java-Instrumentation.

The change itself should look like #116

https://github.com/open-telemetry/opentelemetry-java
Version 1.6.0

https://github.com/open-telemetry/opentelemetry-java-instrumentation
Release v1.6.0