Bump io.opentelemetry:opentelemetry-bom-alpha in /other-examples/java

Bumps [io.opentelemetry:opentelemetry-bom-alpha](https://github.com/open-telemetry/opentelemetry-java) from 1.38.0-alpha to 1.40.0-alpha.
- [Release notes](https://github.com/open-telemetry/opentelemetry-java/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-java/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-java/commits)

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

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

other-examples/java/build.gradle

@@ -29,7 +29,7 @@ subprojects {
     }
 
     dependencies {
-      implementation platform("io.opentelemetry:opentelemetry-bom-alpha:1.38.0-alpha")
+      implementation platform("io.opentelemetry:opentelemetry-bom-alpha:1.40.0-alpha")
       implementation platform("io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom-alpha:2.3.0-alpha")
     }
   }