Update uber/jaeger-client-go and uber/jaeger-lib

Updates:

• uber/jaeger-client-go from 2.15.0 to jaegertracing/jaeger-client-go 2.16.0: https://github.com/jaegertracing/jaeger-client-go/releases/tag/v2.16.0
• uber/jaeger-lib from v1.5.0 to 2.0.0: https://github.com/jaegertracing/jaeger-lib/releases/tag/v2.0.0