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 2.8.0.
- [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...v2.8.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

examples/agent/pom.xml

@@ -25,7 +25,7 @@
         <version.smallrye.config>3.3.4</version.smallrye.config>
 
         <version.opentelemetry>1.39.0</version.opentelemetry>
-        <version.opentelemetry.agent>2.5.0</version.opentelemetry.agent>
+        <version.opentelemetry.agent>2.8.0</version.opentelemetry.agent>
     </properties>
 
     <build>

examples/library/pom.xml

@@ -24,7 +24,7 @@
         <version.resteasy>6.2.9.Final</version.resteasy>
         <version.smallrye.config>3.8.3</version.smallrye.config>
 
-        <version.opentelemetry.agent>2.5.0</version.opentelemetry.agent>
+        <version.opentelemetry.agent>2.8.0</version.opentelemetry.agent>
         <version.opentelemetry.exporter>1.39.0</version.opentelemetry.exporter>
     </properties>