Bump io.opentelemetry:opentelemetry-exporter-otlp from 1.29.0 to 1.31.0

Bumps [io.opentelemetry:opentelemetry-exporter-otlp](https://github.com/open-telemetry/opentelemetry-java) from 1.29.0 to 1.31.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-java/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-java/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-java@v1.29.0...v1.31.0)

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

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

examples/library/pom.xml

@@ -25,7 +25,7 @@
         <version.smallrye.config>3.3.4</version.smallrye.config>
 
         <version.opentelemetry>1.29.0</version.opentelemetry>
-        <version.opentelemetry.exporter>1.29.0</version.opentelemetry.exporter>
+        <version.opentelemetry.exporter>1.31.0</version.opentelemetry.exporter>
     </properties>
 
     <build>