Bump io.opentelemetry.proto:opentelemetry-proto from 1.7.0-alpha to 1.8.0-alpha (#4448)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

smoke-tests/framework/build.gradle.kts

@@ -19,7 +19,7 @@ dependencies {
   implementation("org.eclipse.jetty:jetty-servlet:10.0.26")
 
   implementation("org.mock-server:mockserver-netty:5.15.0:shaded")
-  implementation("io.opentelemetry.proto:opentelemetry-proto:1.7.0-alpha")
+  implementation("io.opentelemetry.proto:opentelemetry-proto:1.8.0-alpha")
 
   // this is exposed in SmokeTestExtension API
   api("org.testcontainers:testcontainers:1.21.3")