Bump io.opentelemetry.proto:opentelemetry-proto

Bumps [io.opentelemetry.proto:opentelemetry-proto](https://github.com/open-telemetry/opentelemetry-proto-java) from 1.8.0-alpha to 1.9.0-alpha.
- [Release notes](https://github.com/open-telemetry/opentelemetry-proto-java/releases)
- [Commits](https://github.com/open-telemetry/opentelemetry-proto-java/commits)

---
updated-dependencies:
- dependency-name: io.opentelemetry.proto:opentelemetry-proto
  dependency-version: 1.9.0-alpha
  dependency-type: direct:development
  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

@@ -97,7 +97,7 @@
     <dependency>
       <groupId>io.opentelemetry.proto</groupId>
       <artifactId>opentelemetry-proto</artifactId>
-      <version>1.8.0-alpha</version>
+      <version>1.9.0-alpha</version>
       <scope>test</scope>
     </dependency>
     <dependency>