Update upstream OpenTelemetry agent dependencies to 2.18.1

[elastic-observability-automation]

@elastic/apm-agent-java, can you please check and merge this PR?

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Upgrade the upstream agent version and related transitive dependencies

Update upstream OpenTelemetry agent version and related dependencies

ran shell command "gradle/update-upstream.sh v2.18.1 && echo \"Update successful\""

v2.18.1

This is a patch release on the previous 2.18.0 release, fixing the issue(s) below.

 ### 🛠️ Bug fixes

- Backport: Shade new `io.opentelemetry.common` package in the bootstrap class loader ([#14283](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/14283))

GitHub Action workflow link

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