[Maps] Add geo alerts dirs to codeowners (#98076)

Co-authored-by: Kibana Machine <[email protected]>

.github/CODEOWNERS

@@ -144,6 +144,8 @@
 /x-pack/test/functional/apps/maps/ @elastic/kibana-gis
 /x-pack/test/functional/es_archives/maps/ @elastic/kibana-gis
 /x-pack/test/visual_regression/tests/maps/index.js @elastic/kibana-gis
+/x-pack/plugins/stack_alerts/server/alert_types/geo_containment @elastic/kibana-gis
+/x-pack/plugins/stack_alerts/public/alert_types/geo_containment @elastic/kibana-gis
 #CC# /src/plugins/maps_legacy/ @elastic/kibana-gis
 #CC# /x-pack/plugins/file_upload @elastic/kibana-gis
 /src/plugins/tile_map/ @elastic/kibana-gis