Bump io.opentelemetry.javaagent:opentelemetry-javaagent

Bumps [io.opentelemetry.javaagent:opentelemetry-javaagent](https://github.com/open-telemetry/opentelemetry-java-instrumentation) from 2.20.1 to 2.21.0.
- [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@v2.20.1...v2.21.0)

---
updated-dependencies:
- dependency-name: io.opentelemetry.javaagent:opentelemetry-javaagent
  dependency-version: 2.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

solace-spring-cloud-stream-binder-opentelemetry/solace-spring-cloud-stream-binder-instrumentation-tests/pom.xml

@@ -132,7 +132,7 @@
                 <artifactItem>
                   <groupId>io.opentelemetry.javaagent</groupId>
                   <artifactId>opentelemetry-javaagent</artifactId>
-                  <version>2.20.1</version>
+                  <version>2.21.0</version>
                   <outputDirectory>${project.build.directory}/thirdParty/</outputDirectory>
                   <destFileName>opentelemetry-javaagent-all.jar</destFileName>
                 </artifactItem>