assign ci-app-libraries-java as owners of weaver instrumentation

Author: daniel-mohedano

.github/CODEOWNERS

@@ -29,6 +29,7 @@ dd-java-agent/instrumentation/testng/      @DataDog/ci-app-libraries-java
 dd-java-agent/instrumentation/gradle-3.0/  @DataDog/ci-app-libraries-java
 dd-java-agent/instrumentation/gradle-8.3/  @DataDog/ci-app-libraries-java
 dd-java-agent/instrumentation/maven-3.2.1/ @DataDog/ci-app-libraries-java
+dd-java-agent/instrumentation/weaver/      @DataDog/ci-app-libraries-java
 dd-smoke-tests/gradle/                     @DataDog/ci-app-libraries-java
 dd-smoke-tests/maven/                      @DataDog/ci-app-libraries-java
 **/civisibility/                           @DataDog/ci-app-libraries-java