fix(deps): update dependency @opentelemetry/semantic-conventions to ~1.20.0

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@opentelemetry/semantic-conventions (source)	~1.19.0 -> ~1.20.0

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Release Notes

open-telemetry/opentelemetry-js (@​opentelemetry/semantic-conventions)

v1.20.0

Compare Source

🚀 (Enhancement)

• perf(otlp-transformer): skip unnecessary base64 encode of span contexts #​4343 @​seemk
• feat(sdk-trace-base): improve log messages when dropping span events #​4223 @​mkubliniak

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