Upgrade to Spring Test for Apache Geode 0.0.28.

Author: jxblum

gradle.properties

@@ -9,7 +9,7 @@ springBootVersion=2.6.0-RC1
 springDataBomVersion=2021.1.0-RC1
 springDataCommonsVersion=2.6.0-RC1
 springDataGeodeVersion=2.6.0-RC1
-springDataGeodeTestVersion=0.0.27
+springDataGeodeTestVersion=0.0.28
 springSessionVersion=2.6.0-SNAPSHOT
 springSessionBomVersion=2021.1.0-SNAPSHOT
 version=2.6.0-SNAPSHOT