Fix TODO: Remove unused okio dependency and add direct jetbrains annotations dependency

Co-authored-by: trask <[email protected]>

Author: Copilot

agent/agent-tooling/build.gradle.kts

@@ -61,9 +61,7 @@ dependencies {
   testImplementation("io.opentelemetry:opentelemetry-sdk-metrics")
   testImplementation("io.opentelemetry:opentelemetry-sdk-logs")
   testImplementation("io.opentelemetry:opentelemetry-sdk-testing")
-
-  // TODO(trask): update tests, no need to use this anymore
-  testImplementation("com.squareup.okio:okio:3.15.0")
+  testImplementation("org.jetbrains:annotations:13.0")
 
   compileOnly(project(":agent:agent-bootstrap"))
   compileOnly("io.opentelemetry.instrumentation:opentelemetry-instrumentation-api")