Bump io.opentelemetry.javaagent:opentelemetry-javaagent

Bumps [io.opentelemetry.javaagent:opentelemetry-javaagent](https://github.com/open-telemetry/opentelemetry-java-instrumentation) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-java-instrumentation@v2.5.0...v2.6.0)

---
updated-dependencies:
- dependency-name: io.opentelemetry.javaagent:opentelemetry-javaagent
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

getting-started-guides/java/build.gradle

@@ -34,7 +34,7 @@ dependencies {
   implementation("io.opentelemetry:opentelemetry-api:1.40.0")
 
   // Add OpenTelemetry java agent to the "agent" configuration we previously defined
-  agent("io.opentelemetry.javaagent:opentelemetry-javaagent:2.5.0")
+  agent("io.opentelemetry.javaagent:opentelemetry-javaagent:2.6.0")
 }
 
 tasks.register("copyAgent", Copy) {