eclipse-rdf4jGH-5060: added comment about zookeeper

Signed-off-by: Bart Hanssens <[email protected]>

core/sail/solr/pom.xml

@@ -16,6 +16,7 @@
 		<zookeeper.version>3.7.2</zookeeper.version>
 	</properties>
 	<dependencies>
+		<!-- use at least zookeeper 3.7.2 to fix CVE, can be removed if solr provides a newer version -->
 		<dependency>
 			<groupId>org.apache.zookeeper</groupId>
 			<artifactId>zookeeper</artifactId>
@@ -26,6 +27,7 @@
 			<artifactId>zookeeper-jute</artifactId>
 			<version>${zookeeper.version}</version>
 		</dependency>
+		<!-- -->
 		<dependency>
 			<groupId>${project.groupId}</groupId>
 			<artifactId>rdf4j-sail-lucene-api</artifactId>