Bump io.opentelemetry:opentelemetry-opencensus-shim

Bumps [io.opentelemetry:opentelemetry-opencensus-shim](https://github.com/open-telemetry/opentelemetry-java) from 1.39.0-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-opencensus-shim
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -15,7 +15,7 @@
     <quarkus.version>3.12.0</quarkus.version>
     <enforcer-plugin.version>3.5.0</enforcer-plugin.version>
     <assertj.version>3.26.3</assertj.version>
-    <opentelemetry-alpha.version>1.39.0-alpha</opentelemetry-alpha.version>
+    <opentelemetry-alpha.version>1.40.0-alpha</opentelemetry-alpha.version>
   </properties>
   <scm>
     <connection>scm:git:[email protected]:quarkiverse/quarkus-google-cloud-services.git</connection>