Bump io.opentelemetry.instrumentation:gradle-plugins from 2.7.0-alpha to 2.8.0-alpha (#3869)

Author: dependabot[bot]

buildSrc/build.gradle.kts

@@ -34,7 +34,7 @@ dependencies {
 
   implementation("org.owasp:dependency-check-gradle:10.0.4")
 
-  implementation("io.opentelemetry.instrumentation:gradle-plugins:2.7.0-alpha")
+  implementation("io.opentelemetry.instrumentation:gradle-plugins:2.8.0-alpha")
 
   implementation("net.ltgt.gradle:gradle-errorprone-plugin:4.0.1")
   implementation("net.ltgt.gradle:gradle-nullaway-plugin:2.0.0")