Update dependency @opentelemetry/core to v2.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@opentelemetry/core (source)	2.11.0 → 2.12.0

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Release Notes

open-telemetry/opentelemetry-js (@​opentelemetry/core)

v2.12.0

Compare Source

2.12.0

🚀 Features

• chore(sdk-trace): add StackContextManager in @opentelemetry/sdk-trace package #​7086

🏠 Internal

• feat(ci): support releasing from maintenance branches #​6767 @​pichlermarc
  • The API documentation site is only redeployed for releases whose commit is reachable from main, so a maintenance release no longer overwrites it.

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