Update module opentracing/opentracing-go to v1.2.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/opentracing/opentracing-go	require	minor	v1.1.0 -> v1.2.0

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Release Notes

opentracing/opentracing-go

v1.2.0

Compare Source

• Use error.object per OpenTracing Semantic Conventions (#​179) -- Rahman Syed
• Convert nil pointer log field value to string "nil" (#​230) -- Cyril Tovena
• Add Go module support (#​215) -- Zaba505
• Make SetTag helper types in ext public (#​229) -- Blake Edwards
• Add log/fields helpers for keys from specification (#​226) -- Dmitry Monakhov
• Improve noop impementation (#​223) -- chanxuehong
• Add an extension to Tracer interface for custom go context creation (#​220) -- Krzesimir Nowak
  • Restore the ability to reset the current span in context to nil (#​231) -- Yuri Shkuro
• Fix typo in comments (#​222) -- meteorlxy
• Improve documentation for log.Object() to emphasize the requirement to pass immutable arguments (#​219) -- 疯狂的小企鹅
• [mock] Return ErrInvalidSpanContext if span context is not MockSpanContext (#​216) -- Milad Irannejad

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