Update dependency org.gitlab4j:gitlab4j-api to v6.0.0-rc.6

Signed-off-by: red-hat-konflux <126015336+red-hat-konflux[bot]@users.noreply.github.com>

Author: red-hat-konflux[bot]

java-components/pom.xml

@@ -301,7 +301,7 @@
             <dependency>
                 <groupId>org.gitlab4j</groupId>
                 <artifactId>gitlab4j-api</artifactId>
-                <version>6.0.0-rc.5</version>
+                <version>6.0.0-rc.6</version>
             </dependency>
             <dependency>
                 <groupId>org.kohsuke</groupId>