Bump com.squareup.okio:okio from 3.11.0 to 3.15.0 (#4258)

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

Author: dependabot[bot]

agent/agent-tooling/build.gradle.kts

@@ -63,7 +63,7 @@ dependencies {
   testImplementation("io.opentelemetry:opentelemetry-sdk-testing")
 
   // TODO(trask): update tests, no need to use this anymore
-  testImplementation("com.squareup.okio:okio:3.11.0")
+  testImplementation("com.squareup.okio:okio:3.15.0")
 
   compileOnly(project(":agent:agent-bootstrap"))
   compileOnly("io.opentelemetry.instrumentation:opentelemetry-instrumentation-api")