Bump io.opentelemetry.javaagent:opentelemetry-javaagent

Bumps [io.opentelemetry.javaagent:opentelemetry-javaagent](https://github.com/open-telemetry/opentelemetry-java-instrumentation) from 1.31.0 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@v1.31.0...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-major
...

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

Author: dependabot[bot]

sample-spring-boot/pom.xml

@@ -96,7 +96,7 @@
         <dependency>
             <groupId>io.opentelemetry.javaagent</groupId>
             <artifactId>opentelemetry-javaagent</artifactId>
-            <version>1.31.0</version>
+            <version>2.21.0</version>
         </dependency>
 
         <dependency>