opentelemetry-jaeger crate is unmaintained

The `opentelemetry-jaeger` crate is deprecated and no longer actively maintained.

The Jaeger propagator implementation has been migrated to
[opentelemetry-jaeger-propagator](https://crates.io/crates/opentelemetry-jaeger-propagator).

More information and examples of using OTLP with Jaeger can be found in
[Introducing native support for OpenTelemetry in Jaeger](https://medium.com/jaegertracing/introducing-native-support-for-opentelemetry-in-jaeger-eb661be8183c)
and
[Exporting OTLP traces to Jaeger](https://github.com/open-telemetry/opentelemetry-rust/tree/main/examples/tracing-jaeger).