Upgrade to Spring Data 2020.0.15.

Closes gh-772

Author: mp911de

pom.xml

@@ -28,7 +28,7 @@
 		<mockk.version>1.10.3-jdk8</mockk.version>
 		<mockito-core.version>3.8.0</mockito-core.version>
 		<spring.version>5.3.26</spring.version>
-		<spring-data-bom.version>2020.0.5</spring-data-bom.version>
+		<spring-data-bom.version>2020.0.15</spring-data-bom.version>
 		<spring-security-bom.version>5.4.5</spring-security-bom.version>
 		<reactor.version>2020.0.13</reactor.version>
 		<java.version>1.8</java.version>