build(deps): bump io.opentelemetry.proto:opentelemetry-proto

Bumps [io.opentelemetry.proto:opentelemetry-proto](https://github.com/open-telemetry/opentelemetry-proto-java) from 0.14.0-alpha to 1.5.0-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-type: direct:production
  update-type: version-update:semver-major
...

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

system-tests/tests/build.gradle.kts

@@ -43,7 +43,7 @@ dependencies {
 
     testFixturesApi("org.junit.jupiter:junit-jupiter-api:${jupiterVersion}")
     testImplementation("io.opentelemetry:opentelemetry-api:${openTelemetryVersion}")
-    testImplementation("io.opentelemetry.proto:opentelemetry-proto:0.14.0-alpha")
+    testImplementation("io.opentelemetry.proto:opentelemetry-proto:1.5.0-alpha")
     testImplementation("org.awaitility:awaitility:${awaitility}")
     testImplementation("org.mock-server:mockserver-netty:${httpMockServer}:shaded")