Bump unboundid-ldapsdk from 5.1.1 to 5.1.3 in /core

Bumps [unboundid-ldapsdk](https://github.com/pingidentity/ldapsdk) from 5.1.1 to 5.1.3.
- [Release notes](https://github.com/pingidentity/ldapsdk/releases)
- [Changelog](https://github.com/pingidentity/ldapsdk/blob/master/docs/release-notes.html)
- [Commits](https://github.com/pingidentity/ldapsdk/compare/5.1.1...5.1.3)

Signed-off-by: dependabot[bot] <support@github.com>

Closes #149

Change-Id: If919ea09c9b9e23c134b45e5c5727de1a98f7f5b
diff --git a/core/pom.xml b/core/pom.xml
index 6233fab..901f728 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -459,7 +459,7 @@
 		<dependency>
 			<groupId>com.unboundid</groupId>
 			<artifactId>unboundid-ldapsdk</artifactId>
-			<version>5.1.1</version>
+			<version>5.1.3</version>
 		</dependency>
 
 		<!-- not part of public release <dependency> <groupId>KorAP-graphDB</groupId>