Update dependency org.gitlab4j:gitlab4j-api to v5.7.0 (#870)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gitlab/pom.xml

@@ -32,7 +32,7 @@
 		<dependency>
 			<groupId>org.gitlab4j</groupId>
 			<artifactId>gitlab4j-api</artifactId>
-			<version>5.6.0</version>
+			<version>5.7.0</version>
 		</dependency>
 
 		<dependency>