added codeowner

Signed-off-by: Alexander Wert <alexander.wert@elastic.co>

Author: AlexanderWert

.github/CODEOWNERS

@@ -411,6 +411,7 @@
 /packages/system/data_stream/uptime @elastic/obs-infraobs-integrations
 /packages/system/manifest.yml @elastic/obs-infraobs-integrations @elastic/sec-linux-platform @elastic/sec-windows-platform
 /packages/system_audit @elastic/sec-linux-platform
+/packages/system_otel @elastic/ingest-otel-data
 /packages/tanium @elastic/security-service-integrations
 /packages/tcp @elastic/sec-deployment-and-devices
 /packages/teleport @elastic/security-service-integrations