Upgrade to Spring Data Ockham-SR15.

Upgrade to Spring Data BOM 2020.0.15 (Ockham-SR15).

Upgrade to Spring Data for Apache Geode 2.4.15.

Author: jxblum

gradle.properties

@@ -12,8 +12,8 @@ pivotalGemFireVersion=9.10.10
 springVersion=5.3.13
 springBootVersion=2.4.13
 springCloudBindingsVersion=1.7.1
-springDataBomVersion=2020.0.14
-springDataGeodeVersion=2.4.14
+springDataBomVersion=2020.0.15
+springDataGeodeVersion=2.4.15
 springDataGeodeTestVersion=0.0.24
 springSessionBomVersion=2020.0.7
 springSessionDataGeodeVersion=2.4.8