Update upstream OpenTelemetry agent dependencies to 2.6.0

[JonasKunz]

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

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Upgrade the upstream agent version and related transitive dependencies

Update OpenTelemetry Contrib version

1 file(s) updated with "$1\"1.36.0-alpha\"": * gradle/libs.versions.toml

Update OpenTelemetry SemConv version

1 file(s) updated with "$1\"1.25.0-alpha\"": * gradle/libs.versions.toml

Update upstream OpenTelemetry agent version

1 file(s) updated with "$1\"2.6.0-alpha\"": * gradle/libs.versions.toml

2.6.0

Release published on the 2024-07-17 01:42:03 +0000 UTC at the url https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/tag/v2.6.0

This release targets the OpenTelemetry SDK 1.40.0.

Note that many artifacts have the `-alpha` suffix attached to their version number, reflecting that they are still alpha quality and will continue to have breaking changes. Please see the [VERSIONING.md](https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/VERSIONING.md#opentelemetry-java-instrumentation-versioning) for more details.

 The Spring Boot Starter (`opentelemetry-spring-boot-starter`) is now stable.

### Migration notes

- The `opentelemetry-spring-boot` and `opentelemetry-spring-boot-3` artifacts have been merged into a single artifact named `opentelemetry-spring-boot-autoconfigure` which supports both Spring Boot 2 and Spring Boot 3
- Two experimental HTTP metrics have been renamed:  - `http.server.request.size` → `http.server.request.body.size`,  - `http.server.response.size` → `http.server.response.body.size`

### 🌟 New javaagent instrumentation

- Javalin ([#11587](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11587))
- ClickHouse ([#11660](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11660))

### 📈 Enhancements

- Support HTTP client instrumentation configuration in Spring starter ([#11620](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11620))
- Influxdb client: don't fill `db.statement` for create/drop database and write operations ([#11557](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11557))
- Support `otel.instrumentation.common.default-enabled` in the Spring starter ([#11746](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11746))
- Support Jetty HTTP client 12 ([#11519](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11519))
- Add Pulsar `messaging.producer.duration` metric ([#11591](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11591))
- Improve instrumentation suppression behavior ([#11640](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11640))
- Propagate OpenTelemetry context through custom AWS client context for Lambda direct calls ([#11675](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11675))
- Spring Native support for `@WithSpan` ([#11757](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11757))
- Support HTTP server instrumentation config properties in the Spring starter ([#11667](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11667))

### 🛠️ Bug fixes

- Fix `http.server.active_requests` metric with async requests ([#11638](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/11638))

### 🙇 Thank you

This release was possible thanks to the following contributors who shared their brilliant ideas and awesome pull requests:

@123liuziming
@breedx-splk
@crossoverJie
@devurandom
@heyams
@jaydeluca
@jeanbisutti
@johnbley
@JonasKunz
@laurit
@lucasamoroso
@pandaji
@steverao
@SylvainJuge
@trask
@tylerbenson
@xiepuhuan
@Yindazz
@zeitlinger

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[github-actions]

👋 @JonasKunz Thanks a lot for your contribution!

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